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

Battlements, stone ramparts and watch tower in historic castle ruins at Arraiolos (Pavao dos Alcaides), built in the 14th century, Alentejo, Portugal, Europe

Majestic ancient castle on a hill with clear blue sky, showcasing historical architecture and heritage, Northumberland, England, United Kingdom, Europe

Ancient Cathedral of Santo Stefano, Castle of Milazzo, Milazzo, Messina, Sicily, Italy, Mediterranean, Europe

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

Sunrise and Hadrian's Wall National Trail in winter, looking to Housesteads Fort, Hadrian's Wall, UNESCO World Heritage Site, Northumberland, England, United Kingdom, Europe

Spanish colonial fortification, Fort de San Felipe, Bacalar, Quintana Roo, Yucatan Peninsula, Mexico, North America

Spanish colonial fortification, Fort de San Felipe, Bacalar, Quintana Roo, Yucatan Peninsula, Mexico, North America

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

Albrechtsburg castle and the Gothic Cathedral dominating the city center, Meissen, Saxony, Germany, 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

Golden Sunburst Framed by the Towering Stone Fortifications of Carcassonne at Dusk Along a Medieval Path

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 the New Fortress overlooking the Old Port Marina at sunset, 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

View of Old Fortress of Corfu and Old Town Marina (NAOK) in Corfu Town, Corfu, Ionian Sea, Greek Islands, Greece, Europe