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Hovenweep Castle, Square Tower Group, Anasazi Ruins, dating from AD1230 to 1275, Hovenweep National Monument, Utah, United States of America, North America

Castle of Lykourgos Logothetis, Pythagorio, Samos, North Aegean Islands, Greek Islands, Greece, Europe

Castle of the Bishops of Siguenza (the Parador of Siguenza), Siguenza, Guadalajara, Castile la Mancha, Spain, Europe

Porte d'Aude through outer wall of old city, Carcassonne, UNESCO World Heritage Site, Languedoc, France, Europe

Tower of Mangana (Torre Mangana), on site of Moorish city, Cuenca, Castille La Mancha, Spain, Europe

Cathedral church tower and ruins inside citadel castle walls Il-Kastell, Victoria Rabat, Gozo, Malta, Mediterranean, Europe

Historic stone castle with towers against a blue sky with scattered clouds at sunset in Lancaster, Lancashire, 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

View of the fortified old village and surrounding mountains, Telouet Kasbah High Atlas, Morocco, North Africa, Africa

Palm trees surrounding the historic fortified residence (kasbah) of Amridil, Skoura, Atlas mountains, Ouarzazate province, Morocco, North Africa, Africa

Looking up to the 16th century Lindisfarne Castle on a hillock overlooking the island of Lindisfarne, United Kingdom

Prague Castle, Hradcany, Mala Strana, and Charles Bridge lit by sunrise, UNESCO World Heritage Site, Prague, Czech Republic, Europe

Konigstein fortress on top of the Elbe sandstone mountains, Friedrich castle observation tower, Konigstein, Saxony, Germany, Europe

View of St. Mary's Church and Roman Pharos, Dover Castle, Dover, Kent, England, United Kingdom, Europe

Entrance to the Alcazar of Seville at the Puerta del Leon (Gate of the Lion), the main access point through the outer wall, UNESCO World Heritage Site, Seville, Andalusia, Spain, Europe

The palm-fringed Torre della Polveriera, a historic stone watchtower in Piazza della Juharia atop the Old Town walls, Alghero, Sassari, Sardinia, Italy, Mediterranean, Europe

View of the Akershus Fortress from inside the walls on a sunny day, Oslo, Norway, Scandinavia, Europe

Evening light on the medieval towers and arched stone bridge of Chateau Comtal in the fortified Cite de Carcassonne, Aude, France

Evening view of the outer ramparts and towers of Chateau Comtal in the UNESCO-listed Cite de Carcassonne

Cityscape of Rome featuring the Mausoleum of Hadrian (Castel Sant'Angelo) (Castle of the Holy Angel), a towering rotunda (cylindrical building) in Parco Adriano, UNESCO World Heritage Site, Rome, Italy, Europe

Green hilly slope and the stone fortification of the Medieval castle of Carcassonne, Languedoc-Roussillon, France

Ruined Castle (Cromwell's Barracks), used by pirates Don Bosco and Grace O'Malley, Inishbofin Island, Connemara, County Galway, Connacht, Republic of Ireland

View of Old Fortress of Corfu in Corfu Town, UNESCO World Heritage Site, Corfu, Ionian Sea, Greek Islands, Greece, Europe

View of Statue of Guilford and Old Fortress of Corfu, UNESCO World Heritage Site, Corfu Town, Corfu, Ionian Sea, Greek Islands, Greece, Europe

Abdullah, guide of the Museum, posing at Nizwa Fort, Ad Dakhiliyah Region, Sultanate of Oman, Arabian Peninsula

Defensive stone walls of Dun Aengus, prehistoric hill fort, Inishmore, largest Aran Island, Galway Bay, County Galway, Connacht, Republic of Ireland

Meadow between walls of Dun Aengus, prehistoric hill fort, Inishmore, largest Aran Island, Galway Bay, County Galway, Connacht, Republic of Ireland

Nafplion historic city view with Palamidi fortress and Bourtzi Castle island, Nafplion, Peloponnese, Greece

San Carlos Bastion housing the City Museum, Defensive Wall of the Old Town, Campeche City, Campeche State, Mexico

Havana Castle of the Royal Force (Castillo de la Real Fuerza), Havana Old Town, UNESCO, Havana, Cuba

Havana Castle of the Royal Force (Castillo de la Real Fuerza), Havana Old Town, UNESCO, Havana, Cuba

Castle of the Three Kings of Morro in foreground, UNESCO, Havana Skyline in the background, Havana, Cuba

Ksar of Ait-Ben-Haddou, UNESCO, Ounila River valley, Ouarzazate Province, region of Draa-Tafilalet, Morocco

Ksar of Ait-Ben-Haddou, UNESCO, Ounila River valley, Ouarzazate Province, region of Draa-Tafilalet, Morocco

Ksar of Ait-Ben-Haddou, UNESCO, Ounila River valley, Ouarzazate Province, region of Draa-Tafilalet, Morocco

Ksar of Ait-Ben-Haddou, UNESCO, Ounila River valley, Ouarzazate Province, region of Draa-Tafilalet, Morocco

Dunseverick Castle near the Giants Causeway, County Antrim, Ulster, Northern Ireland, United Kingdom, Europe

Panorama of Prague Castle, Hradcany, Mala Strana, and Charles Bridge lit by sunrise, UNESCO World Heritage Site, Prague, Czech Republic, Europe

Ancient buildings in the ksar of Ait Ben Haddou, UNESCO World Heritage Site, Ouarzazate province, Morocco, North Africa, Africa

Ancient fortress (Ksar), Ait Ben Haddou, UNESCO World Heritage Site, Ouarzazate province, Morocco, North Africa, Africa

St. Mary in Castro church and Roman Pharos, an ancient lighthouse, at Dover Castle, Dover, Kent, England, United Kingdom, Europe

Chateau de Maintenon in the snow, department of Eure-et-Loir, Centre-Val-de-Loire region, France, Europe

Cite de Carcassonne citadel, UNESCO World Heritage Site, Carcassonne, Aude, Occitania, France, Europe

Cite de Carcassonne citadel, UNESCO World Heritage Site, Carcassonne, Aude, Occitania, France, Europe

Cite de Carcassonne citadel, UNESCO World Heritage Site, Carcassonne, Aude, Occitania, France, Europe

View of Hishi Yagura and Hashizume-mon Gate, Kanazawa Castle, Kanazawa City, Ishikawa Prefecture, Honshu, Japan

View of Sengan-yagura Turret and moat at Osaka Castle (Osaka-jo) on a sunny day, Chuo Ward, Osaka, Honshu, Japan