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Castel del Monte, octagonal castle, built for Emperor Frederick II in the 1240s, UNESCO World Heritage Site, Apulia, Italy, Europe

Castel del Monte, octagonal castle, built for Emperor Frederick II in the 1240s, UNESCO World Heritage Site, Apulia, Italy, Europe

Fort Constitution Lighthouse, Portsmouth, New Hampshire, New England, United States of America, North America

La Chaine and St. Nicholas towers at the entrance to the ancient port of La Rochelle at dusk, Charente-Maritime, France, Europe

The Fort of Nossa Senhora da Penha de Franca, popularly known as the Fortaleza Ponta da Bandeira, built towards the end of the 17th century to defend the harbour, Lagos, Algarve, Portugal, Europe

The Couesnon River leading to the island of Mont Saint-Michel, UNESCO World Heritage Site, Normandy, France, Europe

Students on lawn sunbathing, Royal Fort House architect James Bridges 1761, University of Bristol, England, UK

Fort Beekenburg, Caracas Bay, Curacao, Netherlands Antilles, West Indies, Caribbean, Central America

View across the tranquil waters of Loch Leve in autumn, near Fort William, Highland, Scotland, United Kingdom, Europe

View of a section of the Great Wall, UNESCO World Heritage Site, between Jinshanling and Simatai near Beijing, China, Asia

View of a section of the Great Wall, UNESCO World Heritage Site, between Jinshanling and Simatai near Beijing, China, Asia

Great Wall of China, UNESCO World Heritage Site, and the Yellow River in the Tengger desert at Shapotou near Zhongwei, Ningxia Province, China, Asia

Great Wall of China, UNESCO World Heritage Site, and the Yellow River in the Tengger desert at Shapotou near Zhongwei, Ningxia Province, China, Asia

Skansin fort, old fort guarding Torshavn and its harbour (old brass cannons, WW2 british marine guns and lighthouse), Nolsoy in the distance, Torshavn, Streymoy, Faroe islands (Faroes), Denmark, Europe.

Aerial image of Maiden Castle, an Iron Age hill fort, Winterborne Monkton, near Dorchester, Dorset, England, United Kingdom, Europe

Aerial image of Housesteads Roman Fort of Vercovicium, an auxiliary fort on Hadrian's Wall, UNESCO World Heritage Site, Northumberland, England, United Kingdom, Europe

Aerial image of Oldbury Camp Hill Fort with Cherhill White Horse, Cherhill Down, Calne, Wiltshire, England, United Kingdom, Europe

Aerial image of Rybury Camp, an Iron Age hill fort with Neolithic causewayed enclosure, Wiltshire, England, United Kingdom, Europe

People enjoy an evening walk outside of the Red Fort (Lal Qila), built by Shah Jahan between 1638 and 1648, UNESCO World Heritage Site, Delhi, India, Asia

Aerial image of Maiden Castle, an Iron Age hill fort, Winterborne Monkton, near Dorchester, Dorset, England, United Kingdom, Europe

Aerial image of Uffington White Horse with Uffington Castle hill fort, Berkshire Downs, Vale of White Horse, Oxfordshire, England, United Kingdom, Europe

Aerial view of the Westbury White Horse and the Iron Age Bratton Camp Hill Fort, Wiltshire, England, United Kingdom, Europe

Aerial image of the Uffington White Horse with Uffington Castle hill fort, Berkshire Downs, Vale of White Horse, Oxfordshire, England, United Kingdom, Europe

Aerial image of Battlesbury Camp, an Iron Age Hill fort, Warminster, Wiltshire, England, United Kingdom, Europe

Aerial image of Maiden Castle, an Iron Age hill fort, Winterborne Monkton, near Dorchester, Dorset, England, United Kingdom, Europe

Aerial image of Mount Caburn with the remains of an Iron Age hill fort, east of Lewes, East Sussex, England, United Kingdom, Europe

Aerial image of Westbury chalk quarry, with Westbury White Horse and Bratton Camp Hill Fort in background, Wiltshire, England, United Kingdom, Europe

Elevated view over colorful houses of the Blue City towards Meherangarh Fort, Jodhpur, Western Rajasthan, India, Asia

Elevated view towards Meherangarh Fort with Blue City below, Jodhpur, Western Rajasthan, India, Asia

View to Ben Nevis with snow from Loch Eil, near Fort William, Lochaber, Scotland, United Kingdom, Europe

Frederiksborg Slot Castle built in the 17th century for King Christian 4th on Castle Lake, Hillerod, Zealand, Denmark, Scandinavia, Europe

A woman sells puppets along the fort walls in Jaisalmer in the desert state of Rajasthan, India, Asia

Kristiansten Fortress and local architecture on the River Nidelva, Trondheim, Sor-Trondelag, Norway, Scandinavia, Europe

Mandalay City Fort and Palace reflected in the moat surrrounding the compound at night, Mandalay, Myanmar (Burma), Asia

Winter view over River Etive towards snow-capped mountains, Rannoch Moor, near Fort William, Highland, Scotland, United Kingdom, Europe

Winter view of Loch Ba' at dawn, loch partly frozen with two large rocks protruding from the ice, calm morning, Rannoch Moor, near Fort William, Highland, Scotland, United Kingdom, Europe

Winter view of Rannoch Moor showing lone whitewashed cottage on the bank of a river, dwarfed by snow-covered mountains, and dramatic evening sky, Rannoch Moor, near Fort William, Highland, Scotland, United Kingdom, Europe

A82 trunk road heading across Rannoch Moor towards Glencoe with snow-covered mountains in distance and dramatic evening sky, Rannoch Moor, near Fort William, Highland, Scotland, United Kingdom, Europe

Winter panoramic view of Rannoch Moor showing lone whitewashed cottage on the bank of a river, dwarfed by snow-covered mountains, Rannoch Moor, near Fort William, Highland, Scotland, United Kingdom, Europe

Winter view over River Etive towards snow-capped Buachaille Etive Mor, Rannoch Moor, near Fort William, Highland, Scotland, United Kingdom, Europe

A storm passes behind Bamburgh Castle with the last light of the day illuminating the rocky shoreline and castle, Northumberland, England, United Kingdom, Europe

Top view of the spiral stairs inside the towers of masonic Initiation Well at Quinta da Regaleira, Sintra, Portugal, Europe

Flowers frame old mystical buildings of Romanesque Gothic and Renaissance style, Quinta da Regaleira, Sintra, Portugal, Europe

Fort Bulnes, Magellan Strait Park, southernmost point on mainland South America, near Punta Arenas, Chile

Winter view of Rannoch Moor at sunset with dead tree, frozen stream and snow-covered mountains in the distance, near Fort William, Highland, Scotland, United Kingdom, Europe

Stained glass window by Louis Comfort Tiffany showing an angel holding the Bible, called the World, The American church in Paris, France, Europe

The city wall of Mehrangarh Fort towering over the blue rooftops in Jodhpur, the Blue City, Rajasthan, India, 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

Fortified Ibiza Old Town (Dalt Vila), UNESCO World Heritage Site, Ibiza, Balearic Islands, Spain, 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

A line of climbers on the Lhotse Face, 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