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Ait Hamou ou Said Kasbah, Draa Valley, Morocco, North Africa
Kasbah near El Kelaa M'Gouna, Dades Valley, High Atlas mountains, Morocco, North Africa
Hohensalzburg Fortress and Alt Stadt illuminated at dusk, Salzburg, Salzburger Land, Austria, Europe
Sunrise over Hohensalzburg Fortress and Alt Stadt, Salzburg, Salzburger Land, Austria, Europe
Metal staircase climbing to rock palace fortress, Sigiriya, UNESCO World Heritage Site, Central Province, Sri Lanka, Asia
Bathing pool in rock palace fortress on rock summit, Sigiriya, UNESCO World Heritage Site, Central Province, Sri Lanka, Asia
Rock palace at Sigiriya, UNESCO World Heritage Site, Central Province, Sri Lanka, Asia
Autumn colours on The Great Wall of China at Badaling, China, Asia
Kaleto fortress, rock formations, Belogradchik, Bulgaria, Europe
Church of Surb Astvatsatsin (Vahramashen Church) at Amberd fortress located on the slopes of Mount Aragats, Yerevan, Aragatsotn, Armenia, Central Asia, Asia
Mountain landscape, taken from the top of Sigiriya Rock Fortress (Lion Rock), Sri Lanka, Asia
Views of cruise ships in Port of Barcelona from the Montjuic Castle old military fortress on Montjuic Mountain overlooking the city, Barcelona, Catalonia, Spain, Europe
Views of cruise ships in Port of Barcelona from the Montjuic Castle old military fortress on Montjuic Mountain overlooking the city, Barcelona, Catalonia, Spain, Europe
Man with his horse in the valley of Chehel Burj (Forty Towers fortress), Yaklawang province, Bamyan, Afghanistan, Asia
Fortress of Frederick II of Swabia, Castel del Monte, Andria, Western Murge, Barletta, Apulia, Italy, Europe
Fortress of Frederick II of Swabia, Castel del Monte, Andria, Western Murge, Barletta, Apulia, Italy, Europe
Trogir's historic Stari Grad (Old Town) defensive walls and harbour, Trogir, Dalmatia, Croatia, Europe
Giant statue of Mubarek Ahmed Sharafaddin in front of the citadel of Erbil (Hawler), capital of Iraq Kurdistan, Iraq, Middle East
Snow capped High Atlas Mountains from Kasbah Ait Ben Haddou, near Ouarzazate, Morocco, North Africa, Africa
Roman military camp ruins and the Judaean desert, seen from the Masada fortress, UNESCO World Heritage Site, Israel, Middle East
View over the beautiful mountains around the Citadelle Laferriere, UNESCO World Heritage Site, Cap Haitien, Haiti, Caribbean, Central America
Mirador de San Nicolas, Islamic and Mudejar architecture, Alhambra, UNESCO, Granada, Andalusia, Spain
Evening view from Shanti Stupa to the Namgyal Tsemo fort and monastery (gompa), Leh, Ladakh, India, Asia
The 16th and 17th century fort and monastery at Basgo, Ladakh, Himalayas, India, Asia
The 16th and 17th century fort and monastery at Basgo, Ladakh, Himalayas, India, Asia
The 16th and 17th century fort and monastery at Basgo, Ladakh, Himalayas, India, Asia
Stormy light over the Namgyal Tsemo fort and monastery (gompa), Leh, Ladakh, India, Asia
Alhambra, UNESCO World Heritage Site, Granada, province of Granada, Andalucia, Spain, Europe
Alhambra, UNESCO World Heritage Site, Granada, Province of Granada, Andalusia, Spain, Europe
Peyrepertuse Cathar castle, French Pyrenees, France, Europe
Looking over the Old Town of Kotor and across the Bay of Kotor viewed from the fortress at sunset, UNESCO World Heritage Site, Montenegro, Europe
Lighthouse at Skansin fortress, Torshavn, Streymoy Island, Faroe Islands, Denmark, Europe
Rocca Calascio Castle, Gran Sasso e Monti della Laga National Park, Abruzzo, Italy, Europe
Rocca Calascio Castle and Santa Maria della Pieta Church, Gran Sasso e Monti della Laga National Park, Abruzzo, Italy, Europe
Rocca Calascio Castle, Gran Sasso e Monti della Laga National Park, Abruzzo, Italy, Europe
Rocca Calascio Castle and Santa Maria della Pieta?Church, Gran Sasso e Monti della Laga National Park, Abruzzo, Italy, Europe
Sar Yazd fortress, Iran, Middle East
Fortress of Kufstein, Tyrol, Austria, Europe
Fortress of Burg Hasegg, Hall in Tirol, Tyrol, Austria, Europe
Grapes in the vineyards surrounding Aigle Castle, canton of Vaud, Switzerland, Europe
Aigle Castle and vineyards with the Swiss Alps in background, canton of Vaud, Switzerland, Europe
Castle of Aigle set in rolling hills of vineyards, canton of Vaud, Switzerland, Europe
Lindisfarne Castle on a clifftop, Lindisfarne Island, Holy Island, Lindisfarne, Northumberland, England, United Kingdom, Europe
Catalan flag flies over the Montjuic Castle old military fortress on Montjuic Mountain overlooking the city, Barcelona, Catalonia, Spain, Europe
Views of Port of Barcelona from the Montjuic Castle old military fortress on Montjuic Mountain overlooking the city, Barcelona, Catalonia, Spain, Europe
View of the old town and fortress Hohensalzburg, seen from Kapuzinerberg, Salzburg, Austria, Europe
Norman Swabian Aragonese Castle, Monte Sant'Angelo, Foggia, Apulia, Italy
Cannon in historic castle in medieval village of Marvao, Portalegre district, Alto Alentejo, Portugal, Europe
Montjuic Castle old military fortress on Montjuic Mountain overlooking the city, Barcelona, Catalonia, Spain, Europe
Views of Port of Barcelona from the Montjuic Castle old military fortress on Montjuic Mountain overlooking the city, Barcelona, Catalonia, Spain, Europe
The zig-zag fortress of Sacsayhuaman, with Cuzco in the background, Cuzco, Peru, South America
Montjuic Castle old military fortress on Montjuic Mountain overlooking the city, Barcelona, Catalonia, Spain, Europe
Moorish pool at Castle of Xativa (Jativa), Valencia province, Spain, Europe
The Tiger's Nest Fortress of Paro, Bhutan, Himalayas, Asia
Elevated view over Korcula's picturesque Stari Grad (Old Town) illuminated at dusk, Korcula Town, Korcula, Dalmatia, Croatia, Europe
Samchungsa Temple in the Buso Mountain Fortress in the Busosan Park, Buyeo, South Korea, Asia
Historic castle, medieval village of Marvao, Portalegre district, Alto Alentejo, Portugal, Europe
Flowers framing Oberhofen Castle and Lake Thun, Canton of Bern, Switzerland, Europe
Volcanoes and fossilised sand dune rock structure, Los Escullos, Cabo de Gata natural park, Almeria, Andalusia, Spain, Europe
The Alhambra, UNESCO World Heritage Site, Granada, Andalucia, Spain, Europe
Old cannons in front of the Citadelle Laferriere, UNESCO World Heritage Site, Cap Haitien, Haiti, Caribbean, Central America
Autumn colours on The Great Wall of China at Badaling, China, Asia
Autumn colours on The Great Wall of China at Badaling, China, Asia
Views of the city from Montjuic Castle old military fortress on Montjuic Mountain overlooking the city, Barcelona, Catalonia, Spain, Europe
View of Bay of Kotor from Fortress at dusk, Kotor, UNESCO World Heritage Site, Montenegro, Europe
View of Trautenfels Castle, Schloss Trautenfels Museum, Unterburg, Styria, Austria, Europe
Ben Lui and Kilchurn Castle across Loch Awe, Loch Awe, Argyll and Bute, Scottish Highlands, Scotland, United Kingdom, Europe
Traditional dragon boat, Baengma River, Buso Mountain Fortress in the Busosan Park, Buyeo, South Korea, Asia
The remains of the Crown`s Shaft at Botallack Tin Mine, Cornwall, England, United Kingdom, Europe
Castle of Xativa (Jativa), Valencia province, Spain, Europe
Castle of Xativa (Jativa), Valencia province, Spain, Europe
Rocca Calascio at sunrise with cloud inversion, Calascio, L'Aquila, Abruzzo, Italy, Europe
Looking over the old town of Kotor and across the Bay of Kotor viewed from the fortress at sunset, UNESCO World Heritage Site, Montenegro, Europe
View from Kamerlengo Fortress over the old town of Trogir at sunset, UNESCO World Heritage Site, Croatia, Europe
St. Catherine's Monastery, Sinai, Egypt, North Africa
Chateau Saint Pierre, Bodrum, Egee region, Anatolia, Turkey, Asia Minor, Asia
Elevated view from Kamerlengo Fortress over the old town of Trogir at sunset, UNESCO World Heritage Site, Croatia, Europe
Church of Surb Astvatsatsin (Vahramashen Church) at Amberd fortress located on the slopes of Mount Aragats, Yerevan, Aragatsotn, Armenia, Central Asia, Asia
Rocca Calascio in Calascio, L'Aquila, Abruzzo, Italy, Europe
Harbour seen from Kale fortress, Alanya, southern Turkey, Anatolia, Turkey, Asia Minor, Eurasia
View of Trautenfels Castle, Schloss Trautenfels Museum, Unterburg, Styria, Austria, Europe
Nizwa, Oman, Middle East
Sunrise at the castle of Oberhofen am Thunersee with the snow-covered Bernese Alps, Canton of Bern, Switzerland, Europe
Defensive tower and mountain landscape, Macari, San Vito lo Capo, Sicily, Italy, Mediterranean, Europe
General Gyebaek statue in front of the Buso Mountain Fortress in the Busosan Park, Buyeo, South Korea, Asia
Corfe Castle, Corfe, Dorset, 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
Eilean Donan Castle floodlit at night on Loch Duich, Scotland, United Kingdom, Europe
View to St. Eustatius from Brimstone Hill Fortress, St. Kitts, St. Kitts and Nevis, Leeward Islands, West Indies, Caribbean, Central America
Oberhofen Castle and Lake Thun, Canton of Bern, Switzerland, Europe
View from Moenchsberg Hill across Salzach River with Cathedral, Collegiate Church and Fortress Hohensalzburg, Salzburg, Austria, Europe
Muralhas de Sao Sebastiao (walls of St. Sebastian), fortress constructed to defend the bay of Porto Paim, and the marina, Horta, island of Faial, with Pico mountain on the island of Pico in the distance, Azores, Portugal, Atlantic, Europe
Peyrepertuse Cathar castle, French Pyrenees, France, Europe
View from to the old town and Mont Alban fortress, Villefranche sur Mer, Alpes Maritimes, Cote d'Azur, French Riviera, Provence, France, Mediterranean, Europe
View over the Baengma river from the Buso Mountain Fortress in the Busosan Park, Buyeo, South Korea, Asia
Aerial view of the Amber Fort, Jaipur, Rajasthan, India, Asia
Elevated view from Kamerlengo Fortress over the old town of Trogir at sunset, UNESCO World Heritage Site, Croatia, Europe
Ruins of King Kassapa's Palace in front of the view from of Sigiriya Rock Fortress (Lion Rock), UNESCO World Heritage Site, Sigiriya, Sri Lanka, Asia
Santa Maria della Pieta church and Rocca Calascio, Calascio, L'Aquila, Abruzzo, Italy, Europe
Nafplion (Nafplio), Peloponnese, Greece, Europe