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Hardknott Roman Fort interior looking west along the Eskdale Valley to the Solway Firth, South Lakes, Lake District National Park, Cumbria, England, United Kingdom, Europe
White sand beach and turquoise waters in front of Fort Jefferson, Dry Tortugas National Park, Florida Keys, Florida, United States of America, North America
Brimstone Hill Fortress, 18th century compound, largest and best preserved fortress in the Caribbean, Brimstone Hill Fortress National Park, UNESCO World Heritage Site, St. Kitts, Leeward Islands, West Indies, Caribbean, Central America
A line of climbers on the Lhotse Face, Mount Everest, Solu Khumbu Everest Region, Sagarmatha National Park, UNESCO World Heritage Site, Nepal, Himalayas, Asia
Dunster Castle and Conygar Tower in Exmoor National Park, Somerset, England, United Kingdom, Europe
Turquoise waters and white sand beach in front of Fort Jefferson, Dry Tortugas National Park, Florida Keys, Florida, United States of America, North America
Climbers on the Lhotse Face at 7000m on Mount Everest, Solu Khumbu Everest Region, Sagarmatha National Park, UNESCO World Heritage Site, Nepal, Himalayas, Asia
Harbour and fortress, Cabrera Island, Cabrera National Park, Balearic Islands, Spain, Mediterranean, Europe
Climbers on the Lhotse Face at 7000m on Mount Everest, Solu Khumbu Everest Region, Sagarmatha National Park, UNESCO World Heritage Site, Nepal, Himalayas, Asia
Climbers on the Lhotse Face at 7000m on Mount Everest, Solu Khumbu Everest Region, Sagarmatha National Park, UNESCO World Heritage Site, Nepal, Himalayas, Asia
A line of climbers on the Lhotse Face, Mount Everest, Solu Khumbu Everest Region, Sagarmatha National Park, UNESCO World Heritage Site, Nepal, Himalayas, Asia
Old wagons, Fort Union National Monument, New Mexico, United States of America, North America
Fort Sumter National Monument, Charleston, South Carolina, United States of America, North America
Climbers on the Geneva Spur, Solu Khumbu Everest Region, Sagarmatha National Park, UNESCO World Heritage Site, Nepal, Himalayas, Asia
Brimstone Hill Fortress, 18th century compound, lined with 24 cannons, largest and best preserved fortress in the Caribbean, Brimstone Hill Fortress National Park, UNESCO World Heritage Site, St. Kitts, Leeward Islands, West Indies, Caribbean, Central America
Holly Group, Anasazi Ruins, dating from AD1230 to 1275, Hovenweep National Monument, Utah, United States of America, North America
Extensive remains of the bath site which included changing rooms, hot rooms and cold plunge pools, on the edge of what is now the River North Tyne, dating from AD138, Cilurnum (Chesters Roman Fort), Hadrian's Wall, UNESCO World Heritage Site, Chollerford, Northumbria National Park, England, United Kingdom, Europe
Old wagon wheels with remnants of Fort Union behind, Fort Union National Monument, New Mexico, United States of America, North America
Blue domed mosque minaret, Oman, Middle Easti National Flag and Al-Mirani Fort, Old Muscat, Oman, Middle East
Old wagons, Fort Union National Monument, New Mexico, United States of America, North America
Hovenweep Castle, Square Tower Group, Anasazi Ruins, dating from AD1230 to 1275, Hovenweep National Monument, Utah, United States of America, North America
Fort Jefferson, Dry Tortugas National Park, Florida Keys, Florida, United States of America, North America
Sunrise and Hadrian's Wall National Trail in winter, looking to Housesteads Fort, Hadrian's Wall, UNESCO World Heritage Site, Northumberland, England, United Kingdom, Europe
Large wrought stones recovered from the site of the Roman Bridge that spanned the River North Tyne dating from AD 13, Cilurnum (Chesters Roman Fort), Hadrian's Wall, UNESCO World Heritage Site, Chollerford, Northumbria National Park, England, United Kingdom, Europe
The view from Yew Crags near Hardknott Roman Fort in the west of the Lake District National Park, Cumbria, England, United Kingdom, Europe
Sandy beach, Fort Jefferson, Dry Tortugas National Park, Florida, United States of America, North America
Fort Union National Monument, 1851-1891, New Mexico, United States of America, North America
Brimstone Hill Fortress, 18th century compound, largest and best preserved fortress in the Caribbean, Brimstone Hill Fortress National Park, UNESCO World Heritage Site, St. Kitts, Leeward Islands, West Indies, Caribbean, Central America
Hovenweep Castle, Square Tower Group, Anasazi Ruins, dating from AD1230 to 1275, Hovenweep National Monument, Utah, United States of America, North America
Sunrise on Hadrian's Wall National Trail in winter, looking to Housesteads Fort, Hadrian's Wall, UNESCO World Heritage Site, Northumberland, England, United Kingdom, Europe
Storage alcoves in the changing room of the Roman Baths, dating from AD 138, Cilurnum (Chesters Roman Fort), Hadrian's Wall, UNESCO World Heritage Site, Chollerford, Northumbrian National Park, England, United Kingdom, Europe
Fort Union National Monument and Santa Fe National Historic Trail, New Mexico, United States of America, North America
Sandy beach, Fort Jefferson, Dry Tortugas National Park, Florida, United States of America, North America
Remains of buildings at Fort Union National Monument, New Mexico, United States of America, North America
Sunrise and Hadrian's Wall National Trail in winter, looking to Housesteads Fort, Hadrian's Wall, UNESCO World Heritage Site, Northumberland, England, United Kingdom, Europe
Fort Shirley, Cabrits National Park, Portsmouth, Dominica, West Indies, Caribbean, Central America
Large wrought stones recovered from the site of the Roman Bridge that spanned the River North Tyne dating from AD 138, Cilurnum (Chesters Roman Fort), Hadrian's Wall, UNESCO World Heritage Site, Chollerford, Northumbria National Park, England, United Kingdom, Europe
Late evening light on the Scafells from above Hardknott Fort, Lake District National Park, Cumbria, England, United Kingdom, Europe
Hovenweep Castle, Square Tower Group, Anasazi Ruins, dating from AD1230 to 1275, Hovenweep National Monument, Utah, United States of America, North America
Fort Union National Monument and Santa Fe National Historic Trail, New Mexico, United States of America, North America
Wagon ruts at Fort Union National Monument and Santa Fe National Historic Trail, New Mexico, United States of America, North America
The site of the Commandants House showing supports for suspended floor system with hot air to heat rooms above, dating from AD138, Cilurnum (Chesters Roman Fort), Hadrian's Wall, UNESCO World Heritage Site, Chollerford, Northumbria National Park, England, United Kingdom, Europe
Fort Union National Monument and Santa Fe National Historic Trail, New Mexico, United States of America, North America
Fort Saint James National Historic Site, British Columbia, Canada, North America
Fort Saint James National Historic Site, British Columbia, Canada, North America
Fort Pulaski National Monument, Savannah, Georgia, United States of America, North America
Pecos National Historical Park, New Mexico, United States of America, North America
Fort Saint James National Historic Site, British Columbia, Canada, North America
Fort Saint James National Historic Site, British Columbia, Canada, North America
Harbour and fortress, Cabrera Island, Cabrera National Park, Balearic Islands, Spain, Mediterranean, Europe
View by drone of sunrise over Carreg Cennen Castle in winter, Brecon Beacons National Park, Carmarthenshire, Wales, United Kingdom, Europe
Aerial vista by drone of Carreg Cennen Castle, Brecon Beacons National Park, Carmarthenshire, Wales, United Kingdom, Europe
Carreg Cennen Castle, near Llandeilo, Brecon Beacons National Park, Carmarthenshire, Wales, United Kingdom, Europe
Carreg Cennen Castle, near Llandeilo, Brecon Beacons National Park, Carmarthenshire, Wales, United Kingdom, Europe
Higger Tor, autumn sunrise, Hathersage Moor, from Carl Wark Hill Fort, Peak District National Park, Derbyshire, England, United Kingdom, Europe
Carl Wark Hill Fort and Hathersage Moor from Higger Tor, sunrise in autumn, Peak District National Park, Derbyshire, England, United Kingdom, Europe
Hardknott Roman Fort, Hardknott Pass, Lake District National Park, UNESCO World Heritage Site, Cumbria, England, United Kingdom, Europe
Brimstone Hill Fortress, 18th century compound, largest and best preserved fortress in the Caribbean, Brimstone Hill Fortress National Park, UNESCO World Heritage Site, St. Kitts, Leeward Islands, West Indies, Caribbean, Central America
Aerial winter view of the snow covered medieval village of Rocca Calascio with the castle surrounded by clouds at dusk, Rocca Calascio, Gran Sasso e Monti della Laga National Park, Campo Imperatore, L'Aquila province, Abruzzo region, Italy, Europe
Carreg Cennen Castle, near Llandeilo, Brecon Beacons National Park, Carmarthenshire, Wales, United Kingdom, Europe
Carl Walk Iron Age Hill Fort in autumn, Hathersage Moor, Peak District National Park, Derbyshire, England, United Kingdom, Europe
Brimstone Hill Fortress, 18th century compound, lined with 24 cannons, largest and best preserved fortress in the Caribbean, Brimstone Hill Fortress National Park, UNESCO World Heritage Site, St. Kitts, Leeward Islands, West Indies, Caribbean, Central America
Ripley Caste reflected on the still water of the Lake, Nidderdale, The Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe
Aerial view of Carew Castle reflected in the mill pond on a still spring morning, Pembrokeshire Coast National Park, Wales, United Kingdom, Europe
View over Fort Amhearst from Signal Hill National Historic Site, St. John's, Newfoundland, Canada, North America
Glenveagh castle in the Glenveagh National Park, County Donegal, Ulster, Republic of Ireland, Europe
Higger Tor, sunrise in autumn, Hathersage Moor, from Carl Wark Hill Fort, Peak District National Park, Derbyshire, England, United Kingdom, Europe
Carew Castle reflected in the mill pond on a still spring morning, Pembrokeshire Coast National Park, Wales, United Kingdom, Europe
View of Castleton village and stream overlooked by Peveril Castle, Hope Valley, Peak District National Park, Derbyshire, England, United Kingdom, Europe
Glenveagh castle on lake Lough Beagh in the Glenveagh National Park, County Donegal, Ulster, Republic of Ireland, Europe
Winter view of Rocca Calascio castle after heavy snowfall, Rocca Calascio, Gran Sasso and Monti della Laga National Park, L'Aquila province, Abruzzo region, Apennines, Italy, Europe
Castle of Kruje, The National Skanderberg Museum, Kruje, Albania, Europe
Housesteads Roman Fort, Vercovicium, AD 124, Granary showing provision for underfloor heating, Hadrians Wall, UNESCO World Heritage Site, Northumbria National Park, Northumberland, England, United Kingdom, Europe
Higger Tor, Carl Wark Hill Fort and Hathersage Moor, sunrise in autumn, Peak District National Park, Derbyshire, England, United Kingdom, Europe
Hardknott Roman Fort, Hardknott Pass, Lake District National Park, UNESCO World Heritage Site, Cumbria, England, United Kingdom, Europe
Man admiring the snowy medieval castle of Rocca Calascio after heavy snowfall, Rocca Calascio, Gran Sasso and Monti della Laga National Park, L'Aquila province, Abruzzo region, Apennines, Italy, Europe
Castle of Kruje, The National Skanderberg Museum, Kruje, Albania, Europe
View of Castleton village and stream overlooked by Peveril Castle, Hope Valley, Peak District National Park, Derbyshire, England, United Kingdom, Europe
The historic Dunster Castle, on the edge of the village of Dunster, Exmoor National Park, Somerset, England, United Kingdom, Europe
National fort built by Vauban in 1689, St. Malo, Brittany, France, Europe
Close-up view of the roof of the church of Santa Maria della Pieta with snow covered mountains of Gran Sasso lit at sunset, Rocca Calascio, Gran Sasso e Monti della Laga National Park, Campo Imperatore, L'Aquila province, Abruzzo, Italy, Europe
Close-up aerial view of the snow covered medieval castle of Rocca Calascio and the church of Santa Maria della Pieta� at dusk, Rocca Calascio, Gran Sasso e Monti della Laga National Park, Campo Imperatore, L'Aquila province, Abruzzo region, Italy, Europe
Aerial winter view of the snow covered medieval village of Rocca Calascio with the castle and pink clouds at dusk, Rocca Calascio, Gran Sasso e Monti della Laga National Park, Campo Imperatore, L'Aquila province, Abruzzo region, Italy, Europe
Aerial winter view of the snow covered medieval village of Rocca Calascio with the castle and pink sky at sunset, Rocca Calascio, Gran Sasso e Monti della Laga National Park, Campo Imperatore, L'Aquila province, Abruzzo region, Italy, Europe
Fort of Santa Teresa, Santa Teresa National Park, Uruguay, South America
Brent Tor church in early morning fog, North Brentor, Dartmoor National Park, Devon, England, United Kingdom, Europe
Winter view of the snow covered illuminated medieval village of Rocca Calascio with the castle at dusk, Rocca Calascio, Gran Sasso e Monti della Laga National Park, Campo Imperatore, L'Aquila province, Abruzzo region, Italy, Europe
Winter view of the snowy medieval village of Rocca Calascio with the castle on top of the hill at dusk, Rocca Calascio, Gran Sasso e Monti della Laga National Park, Campo Imperatore, L'Aquila province, Abruzzo region, Italy, Europe
The snow covered castle of Rocca Calascio among ruins of the old village seen from an arch, Rocca Calascio, Gran Sasso e Monti della Laga National Park, Campo Imperatore, L'Aquila province, Abruzzo, Italy, Europe
Winter view of the Renaissance church of Santa Maria della Pieta with snow seen from the castle of Rocca Calascio, Gran Sasso e Monti della Laga National Park, Campo Imperatore, L'Aquila province, Abruzzo, Italy, Europe
Namutoni Fort, accommodation in restcamp at Namutoni, Etosha National Park, Namibia, Africa
Aerial winter view of the snow covered Rocca Calascio castle and church of Santa Maria della Pieta,�with pink clouds at sunset, Rocca Calascio, Gran Sasso e Monti della Laga National Park, Campo Imperatore, L'Aquila province, Abruzzo, Italy, Europe
Fort of Santa Teresa, Santa Teresa National Park, Uruguay, South America
Aerial of the Fort of Santa Teresa, Santa Teresa National Park, Uruguay, South America
Castillo San Marcos National Monument, St. Augustine, Florida, United States of America, North America
Beach and national fort, St. Malo, Brittany, France, Europe
Castell Henllys, a reconstructed Iron Age hill fort circa 600BC, Pembrokeshire Coast National Park, Pembrokeshire, Wales, United Kingdom, Europe
Passageway, Fort Jefferson, Dry Tortugas National Park, Florida, United States of America, North America
Maharaja of Jaipur's Hunting Lodge with Ranthambhore Fort behind in Ranthambhore National Park, Rajasthan, Northern India
Lighthouse, Fort Jefferson, Dry Tortugas National Park, Florida, United States of America, North America