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Hardknott Roman Fort interior looking west along the Eskdale Valley to the Solway Firth, South Lakes, Lake District National Park, Cumbria, England, United Kingdom, Europe

The whitewashed city wall, including a defensive tower, in the white city (Citta Bianca), Ostuni, Apulia, Italy, Europe

Castel del Monte, octagonal castle, built for Emperor Frederick II in the 1240s, UNESCO World Heritage Site, Apulia, Italy, Europe

Castel del Monte, octagonal castle, built for Emperor Frederick II in the 1240s, UNESCO World Heritage Site, Apulia, Italy, Europe

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

Guide talking to tourists at the Inca fortification of Sacsayhuaman, near Cuzco, Peru, South America

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

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

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

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

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

Fortified Ibiza Old Town (Dalt Vila), UNESCO World Heritage Site, Ibiza, Balearic Islands, 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

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

Rumeli Hisari (Fortress of Europe) and Fatih Sultan Mehmet Suspension Bridge, Hisarustu, Bosphorus Strait, Istanbul, Turkey, Europe

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

Monnow Bridge and Gate over the River Monnow, Monmouth, Monmouthshire, Wales, United Kingdom, Europe

The 13th century medieval castle and gardens in Marvao, built by King Dinis, Marvao, Alentejo, Portugal, Europe

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

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

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

The Ruin of Newark Castle on the Fife Coast Path near St. Monans, Fife, Scotland, United Kingdom, Europe

The gate of Castello Svevi, the 13th century castle built for King Frederick II, the Holy Roman Emperor, in Trani, Apulia, Italy, Europe

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

Viellevieille Castle, dating from the 11th century, with a Renaissance facade, in Villevieille, Gard, Languedoc-Roussillon, France, Europe

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

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