Aerial view of the Amber Fort, Jaipur, Rajasthan, India, Asia

The round Norman Keep (Round Tower) in Windsor Castle with the Queen's flag (Royal Standard) flying, Windsor, Berkshire, England, United Kingdom, Europe

Suraj Kund, Gwalior Fort, Gwalior, Madhya Pradesh, India, Asia

Flock of Oystercatchers, South Walney Nature Reserve, blocking out the distant Piel Castle, just visible on Piel Island, Cumbrian Coast, Furness Peninsula, Cumbria, England, United Kingdom, Europe

Baroque Bratislava Castle (Bratislavsky hrad) with flag flying, Bratislava, Slovakia, Europe

Fort Saint Jean, Marseille, Bouches du Rhone, Provence, Provence-Alpes-Cote d'Azur, France, Mediterranean, Europe

Woman feeding pigeons with corn at Amber Fort in Rajasthan, India, Asia

Eilean Donan Castle, a Highland fortress, with Saltire Scottish flag flying in Loch Alsh at Dornie, Kyle of Lochalsh in the western hIghlands of Scotland, United Kingdom, Europe

Fishermen fishing by Eilean Donan Castle, a Highland fortress, with Saltire Scottish flag flying in Loch Alsh at Dornie, Kyle of Lochalsh in the western hIghlands of Scotland, United Kingdom, Europe

Crow flying over Eagle's Nest, Kehlsteinhaus, Hitler's lair at Berchtesgaden in the Bavarian Alps, Germany

Marana Regional Airport, Wings of Freedom Tour, airshow, Boeing B-17G Flying Fortress, introduced in 1938, Marana, Arizona, United States of America, North America

Marana Regional Airport, Wings of Freedom Tour, airshow, Boeing B-17G Flying Fortress, introduced in 1938, Marana, Arizona, United States of America, North America

Marana Regional Airport, Wings of Freedom Tour, airshow, Boeing B-17G Flying Fortress, introduced in 1938, Marana, Arizona, United States of America, North America

Marana Regional Airport, Wings of Freedom Tour, airshow, Boeing B-17G Flying Fortress, introduced in 1938, Marana, Arizona, United States of America, North America

Palacio de Aljaferia palace illuminated at night under floodlights, flags flying over external wall and towers, Moorish architecture, Zaragoza, Saragossa, Aragon, Spain

Palacio de Aljaferia palace illuminated at night under floodlights, flags flying over external wall and towers, Moorish architecture, Zaragoza, Saragossa, Aragon, Spain

Prayer flags flying above the Yarlung valley on Yumbulagang Palace, first and oldest fortress in Tibet, Himalayas, Central Tibet, Tibet, China, Asia

Palacio de Aljaferia palace illuminated at night, flags flying over external wall and towers, Moorish architecture, Zaragoza, Saragossa, Aragon, Spain