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View of Conwy Castle, UNESCO World Heritage Site, and boats on the shore, Conwy, Conway County Borough, Wales, United Kingdom, Europe

Aerial drone view of Baixa District, facing south towards the Tagus River with the major landmarks visible including St. George Castle, Pantheon, Figueira, Rossio Square, Martim Moniz Squares, Lisbon, Portugal, Europe

Castle Tioram on the coastal island Eilean Tioram where River Shiel and Loch Moidart meet, at low tide on a sunny winter morning, Highlands, Scotland, United Kingdom, Europe

Castle Tioram on the coastal island Eilean Tioram where River Shiel and Loch Moidart meet, at low tide on a sunny winter morning, Highlands, Scotland, United Kingdom, Europe

Early morning view of Castle Tioram and Loch Moidart as dawn breaks in a warm colorful sky to form attractive reflections, Highlands, Scotland, United Kingdom, Europe

View over Charlotte Amalie, capital of St. Thomas, with Fort Christian, US Virgin Islands, West Indies, Caribbean, Central America

Vianden Castle above the Town of Vianden on Our River, Canton of Vianden, Grand Duchy of Luxembourg, Europe

Clouds in the sky and grass in the foreground, Mont-Saint-Michel, UNESCO World Heritage Site, Normandy, France, Europe

Sheep grazing with the village in the background, Mont-Saint-Michel, UNESCO World Heritage Site, Normandy, France, Europe

Lovrjenac Fort and Bokar Tower from Old Town City Walls, Dubrovnik, UNESCO World Heritage Site, Dalmatia, Croatia, Europe

Carl Wark Hill Fort and Hathersage Moor from Higger Tor, sunrise in autumn, Peak District National Park, Derbyshire, England, United Kingdom, Europe

Higger Tor, autumn sunrise, Hathersage Moor, from Carl Wark Hill Fort, Peak District National Park, Derbyshire, England, United Kingdom, Europe

Higger Tor, sunrise in autumn, Hathersage Moor, from Carl Wark Hill Fort, Peak District National Park, Derbyshire, England, United Kingdom, Europe

The Old Fort, Arabic fortress in Stone Town, UNESCO World Heritage Site, Zanzibar, Tanzania, East Africa, Africa

Fort Sant' Angelu, Birgu and the Grand Harbour in Valletta, UNESCO World Heritage Site and European Capital of Culture 2018, Valletta, Malta, Mediterranean, Europe

Senglea, one of the Three Cities, and the Grand Harbour in Valletta, UNESCO World Heritage Site and European Capital of Culture 2018, Malta, Mediterranean, Europe

Part of the 7km long 18th century wall round Lakhpat Fort on the Kori creek looking out at the border between India and Pakistan, Gujarat, India, Asia

Aggstein Castle Ruin on Danube River at sunset, Cultural Landscape Wachau, UNESCO World Heritage Site, Austria, Europe

Berber granary, Agadir Tashelhit, in the form of a fortress, Anti-Atlas mountains, Morocco, North Africa, Africa

Inside walls of the Berber granary, Agadir Tashelhit, over 700 years old, Anti-Atlas mountains, Morocco, North Africa, Africa

Behind the walls of the Berber granary, Agadir Tashelhit, Anti-Atlas mountains, Morocco, North Africa, Africa

Berber granary, Agadir Tashelhit, in the form of a fortress, Anti-Atlas mountains, Morocco, North Africa, Africa

Passageway between two buildings in Taroudant, old Berber architecture, Taroudant, Morocco, North Africa, Africa

Canoeing Loch Lochy, part of the Caledonian Canal, Fort William, Scottish Highlands, Scotland, United Kingdom, Europe

Canoeing Loch Lochy, part of the Caledonian Canal, Fort William, Scottish Highlands, Scotland, United Kingdom, Europe

Canoeing Loch Oich, along the Caledonian Canal, near Fort William, Scottish Highlands, Scotland, United Kingdom, Europe

Canoeing Loch Oich, along the Caledonian Canal, near Fort William, Scottish Highlands, Scotland, United Kingdom, Europe

Canoeing the Caledonian Canal, near Fort Augustus, Scottish Highlands, Scotland, United Kingdom, Europe

Canoeing Loch Ness section of the Caledonian Canal, near Fort Augustus, Scottish Highlands, Scotland, United Kingdom, Europe

Canoeing Loch Ness section of the Caledonian Canal, near Fort Augustus, Scottish Highlands, Scotland, United Kingdom, Europe

Canoeing the Caledonian Canal, near Fort William, Scottish Highlands, Scotland, United Kingdom, Europe

Canoeing Loch Ness section of the Caledonian Canal, near Fort Augustus, Scottish Highlands, Scotland, United Kingdom, Europe

Canoeing Loch Lochy, part of the Caledonian Canal, Fort William, Scottish Highlands, Scotland, United Kingdom, Europe

Canoeing Loch Ness section of the Caledonian Canal, near Fort Augustus, Scottish Highlands, Scotland, United Kingdom, Europe

Castel Sant'Angelo (Mausoleum of Hadrian) seen from Janiculum Terrace at sunset, Rome, Lazio, Italy, Europe

Fortification on top of Puig de St. Maria, Pollenca, Majorca, Balearic Islands, Spain, Mediterranean, Europe

Ovo Castle fortifications with canons at Castel dell Ovo islet fortress and city view at the Gulf of Napoli, Naples, Campania, Italy, Europe

View of Golden Gate Bridge and Fort Point from Marine Drive, San Francisco, California, United States of America, North America

Hardknott Roman Fort, Hardknott Pass, Lake District National Park, UNESCO World Heritage Site, Cumbria, England, United Kingdom, Europe

View of Golden Gate Bridge and Fort Point from Marine Drive, San Francisco, California, United States of America, North America

Fortified floors and terrace view of the Torre de Belem (Belem Tower), medieval defensive tower on the bank of Tagus River, UNESCO World Heritage Site, Belem, Lisbon, Portugal, Europe

Torre de Belem (Belem Tower), medieval defensive tower on the bank of Tagus River, UNESCO World Heritage Site, Belem, Lisbon, Portugal, Euyrpe

Fortified floors and terrace view of the Torre de Belem (Belem Tower), medieval defensive tower on the bank of Tagus River, UNESCO World Heritage Site, Belem, Lisbon, Portugal, Europe

Fortified floors and terrace view of the Torre de Belem (Belem Tower), medieval defensive tower on the bank of Tagus River, UNESCO World Heritage Site, Belem, Lisbon, Portugal, Europe