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Fortress of Frederick II of Swabia, Castel del Monte, Andria, Western Murge, Barletta, Apulia, Italy, Europe

Rumeli Hisari (Fortress of Europe or Rumelihisari), elevated view from the Bosphorus Strait, Hisarustu, Istanbul, Turkey, Europe

The Norman gateway and staircase tower at the ruins of Newark Castle in Newark-upon-Trent, Nottinghamshire, England, United Kingdom, Europe

The Norman gateway and staircase tower at the ruins of Newark Castle in Newark-upon-Trent, Nottinghamshire, England, United Kingdom, Europe

Cannon in historic castle in medieval village of Marvao, Portalegre district, Alto Alentejo, Portugal, Europe

Entrance to the Fortaleza de Sao Miguel (St. Michael Fortress) now the Museum of the Armed Forces, Luanda, Angola, Africa

Calahorra Tower and the Roman bridge (Puente Romano) over the Rio Guadalquivir, UNESCO World Heritage Site, Cordoba, Andalucia, Spain, Europe

Patio de Arrayanes, Palacios Nazaries, The Alhambra, UNESCO World Heritage Site, Granada, Andalucia, Spain, Europe

Night shot of the main square (Trg Svetog Stjepana) of Hvar Town with view to the Spanish Fortress in the background, Hvar, Croatia, Europe

Defensive walls San Cibrao de Las hill fort, Castro Culture archeological site, San Amaro, Ourense, Galicia, Spain, Europe

Defensive walls and ramparts with view over surrounding countryside from the Castle of Terena, a listed national monument, Terena, Alentejo Central, Portugal, Europe

Montjuic Castle old military fortress on Montjuic Mountain overlooking the city, Barcelona, Catalonia, Spain, Europe

Historic walled defences to Moorish citadel fortress palace of the Alcazaba, Malaga, Andalusia, Spain, Europe

Castle of Castillo de San Felipe, Los Escullos, Cabo de Gata natural park, Almeria, Andalusia, Spain, Europe

The Castel Grumello built on an morenic outcrop, surrounded by a fascinating landscape of grapes grown to produce wine, Lombardy, Italy, Europe

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

Calahorra Tower and the Roman bridge (Puente Romano) over the Rio Guadalquivir, UNESCO World Heritage Site, Cordoba, Andalucia, Spain, Europe

Looking across the calm waters of Havana Bay to Havana with the 16th century fortress, Morro Castle, standing guard, Havana, Cuba, West Indies, Caribbean, Central America

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

Medieval stone tower on a grassy hill with clear blue sky, flanked by church spires in the background, Clifford's Tower, York, North Yorkshire, England, United Kingdom, Europe

Medieval stone tower atop a lush green hill against a vibrant blue sky with fluffy clouds, symbolizing historical fortification and ancient architecture in York, North Yorkshire, England.

The main square (Trg Svetog Stjepana) of Hvar Town with view to the Spanish Fortress in the background at first sunlight, Hvar, Croatia, Europe

Amberd fortress located on the slopes of Mount Aragats, with Mount Ararat in the distance, Yerevan, Aragatsotn, Armenia, Central Asia, Asia

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

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

Castillo de la Real Fuerza, La Habana Vieja, UNESCO World Heritage Site, Havana, Cuba, West Indies, Central America

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

Cannons on ramparts of citadel castle Il-Kastell, Victoria Rabat, Gozo, Malta, Mediterranean, Europe

Castle Menzies, the ancestral seat of Clan Menzies, west of the village of Weem, near Aberfeldy, Perthshire, Scotland, United Kingdom, Europe

Rustic stone ruins in a green countryside under a cloudy sky, North Yorkshire, 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

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

Burg Kreuzenstein castle, Leobendorf, Weinviertel Region, Lower Austria, near Vienna, Austria, Europe