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San Sebastian Fort, City of Sao Tome, Sao Tome and Principe, Atlantic Ocean, Africa
The original Mutianyu section of the Great Wall, UNESCO World Heritage Site, Beijing, China, Asia
The original Mutianyu section of the Great Wall, UNESCO World Heritage Site, Beijing, China, Asia
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
Old watchtower Baluarte de San Diego, Intramuros, Manila, Luzon, Philippines, Southeast Asia, Asia
Entrance to the old Fort Santiago, Intramuros, Manila, Luzon, Philippines, Southeast Asia, Asia
Entrance to the old Fort Santiago, Intramuros, Manila, Luzon, Philippines, Southeast Asia, Asia
Entrance to the old Fort Santiago, Intramuros, Manila, Luzon, Philippines, Southeast Asia, Asia
Old watchtower Baluarte de San Diego, Intramuros, Manila, Luzon, Philippines, Southeast Asia, Asia
Fort San Pedro, Cebu City, Cebu, Philippines, Southeast Asia, Asia
Geese at Leeds Castle, Maidstone, Kent, England, United Kingdom, Europe
Leeds Castle, Maidstone, Kent, England, United Kingdom, Europe
Leeds Castle, Maidstone, Kent, England, United Kingdom, Europe
Victor Column, Kalemegdan Fortress, Belgrade, Serbia, 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
Guide talking to tourists at the Inca fortification of Sacsayhuaman, near Cuzco, Peru, South America
Inca fortification of Sacsayhuaman with Cuzco in background, 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
Rajmahal Palace, Jaisalmer, Western Rajasthan, India, Asia
Sigiriya Rock, tourist enjoying the view over the Sri Lankan landscape, Sri Lanka, Asia
Sigiriya Rock, tourist enjoying the view over the Sri Lankan landscape, Sri Lanka, Asia
Jersey Round Tower, Le Hocq, St. Clement, Jersey, Channel Islands,Europe
The Blue City of Jodhpur seen from the Mehrangarh Fort, Jodhpur, Rajasthan, India, Asia
Dunnottar Castle outside of Stonehaven, Aberdeenshire, Scotland, United Kingdom, Europe
Montjuic Castle old military fortress on Montjuic Mountain overlooking the city, Barcelona, Catalonia, Spain, Europe
Old Islamic tower, UNESCO World Heritage Site, Caceres, Extremadura, Spain, Europe
The Arab Puerta de Almodovar and the mediaeval wall, Cordoba, Andalucia, 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
Hever Castle and gardens, Hever, Kent, England, United Kingdom, Europe
Alcazar Castle, UNESCO, Segovia, Castile and Leon, Spain
Eilean Donan Castle floodlit at night on Loch Duich, Scotland, United Kingdom, Europe
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
Ait-Benhaddou Kasbah, Morocco, North Africa
Fortress of Frederick II of Swabia, Castel del Monte, Andria, Western Murge, Barletta, Apulia, Italy, Europe
Fortified Ibiza Old Town (Dalt Vila), UNESCO World Heritage Site, Ibiza, Balearic Islands, Spain, Europe
Chateau de Peyrepertuse, a Cathar castle, Languedoc, France, Europe
St. Rules Tower at St. Andrews Cathedral, Fife, Scotland, United Kingdom, Europe
St. Rules Tower at St. Andrews Cathedral, Fife, Scotland, United Kingdom, Europe
St. Andrews Castle, Fife, Scotland, United Kingdom, Europe
St. Andrews Castle, Fife, Scotland, United Kingdom, 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
Kidwelly Castle, Carmarthenshire, Wales, United Kingdom, Europe
Kidwelly Castle, Carmarthenshire, Wales, United Kingdom, Europe
View from Mirador de San Nicolas to The Alhambra, UNESCO, Mudejar architecture, Granada, Andalusia, Spain
Spiez Castle Church, Spiez, Canton of Bern, Switzerland
Fort San Felipe de Lara, Rio Dulce, Guatemala, Central America
Historic walled defences to Moorish citadel fortress palace of the Alcazaba, Malaga, Andalusia, Spain, Europe
Exterior of Agra Fort, UNESCO World Heritage Site, Agra, Uttar Pradesh, India, Asia
Tower of David through trees, Jerusalem Old City, Israel, Middle East
The harbour and Fort da Ponta da Bandeira in the Old Town of Lagos, Algarve, Portugal
Alcazaba, Malaga, Andalusia, Spain
St. Mawes Castle and coastline, St. Mawes, Cornwall, England, United Kingdom, Europe
Norman-Swabian Castle, Barletta, Barletta-Andria-Trani, Apulia, Italy
Castle of Charles V, Monopoli, Bari, Apulia, Italy
Norman-Swabian Castle, Barletta, Barletta-Andria-Trani, Apulia, Italy
Garagnone Fortress, Garagnone Castle, Spinazzola, Barletta-Andria-Trani, Murgia, Apulia, Italy
De Monti Castle (Castello de Monti), Corigliano d'Otranto, Lecce, Salento, Apulia, Italy
De Monti Castle (Castello de Monti), Corigliano d'Otranto, Lecce, Salento, Apulia, Italy
De Monti Castle (Castello de Monti), Corigliano d'Otranto, Lecce, Salento, Apulia, Italy
De Monti Castle (Castello de Monti), Corigliano d'Otranto, Lecce, Salento, Apulia, Italy
De Monti Castle (Castello de Monti), Corigliano d'Otranto, Lecce, Salento, Apulia, Italy
De Monti Castle (Castello de Monti), Corigliano d'Otranto, Lecce, Salento, Apulia, Italy
De Monti Castle (Castello de Monti), Corigliano d'Otranto, Lecce, Salento, Apulia, Italy
Gibralfaro Castle, Malaga, Andalusia, Spain, Europe
Bari, Apulia, Italy
Castle of Carlo V, Lecce, Salento, Apulia, Italy
Swabian Castle, Trani, Barletta-Andria-Trani, Apulia, Italy
Swabian Castle, Trani, Barletta-Andria-Trani, Apulia, Italy
Swabian Castle, Trani, Barletta-Andria-Trani, Apulia, Italy
Town Hall and Fort, Trani, Barletta-Andria-Trani, Apulia, Italy
Massafra Castle, Massafra, Taranto, Apulia, Italiy
Norman Swabian Aragonese Castle, Monte Sant'Angelo, Foggia, Apulia, Italy
Norman Swabian Aragonese Castle, Monte Sant'Angelo, UNESCO, Foggia, Apulia, Italy
Norman Swabian Aragonese Castle, Monte Sant'Angelo, UNESCO, Foggia, Apulia, Italy
Norman Swabian Aragonese Castle, Monte Sant'Angelo, UNESCO, Foggia, Apulia, Italy
Tower of David museum, the main courtyard, jerusalem Old City, Israel, Middle East
Castelo de Silves, Silves, Algrave, Portugal
The Castle at sunrise, St Andrews, Fife, Scotland
Burgergarde fort and city walls, Monchsberg Hill, Salzburg, Austria, Europe
Stone archway in Mehrangarh Fort in Jodhpur, the Blue City, Rajasthan, India, Asia
The 16th and 17th century fort and monastery at Basgo, Ladakh, Himalayas, India, Asia
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
City gate, Mdina, Malta, Mediterranean, Europe
Stone walled city and St. Paul's Cathedral, Mdina, Malta, Mediterranean, Europe
Bender fortress in Bender, Republic of Transnistria, Moldova, 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 13th century medieval castle 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
Agra Fort at sunset, UNESCO World Heritage Site, Agra, Uttar Pradesh, 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