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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
Fort San Pedro, Cebu City, Cebu, Philippines, Southeast Asia, Asia
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
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
Jersey Round Tower, Le Hocq, St. Clement, Jersey, Channel Islands,Europe
Dunnottar Castle outside of Stonehaven, Aberdeenshire, Scotland, 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
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. Andrews Castle, Fife, Scotland, United Kingdom, Europe
St. Andrews Castle, Fife, Scotland, United Kingdom, Europe
Kidwelly Castle, Carmarthenshire, Wales, United Kingdom, Europe
Fort San Felipe de Lara, Rio Dulce, Guatemala, Central America
St. Mawes Castle and coastline, St. Mawes, Cornwall, England, United Kingdom, Europe
Guimaraes Castle, Guimaraes, UNESCO, Minho Region, Portugal
Norman-Swabian Castle, Barletta, Barletta-Andria-Trani, Apulia, Italy
Norman-Swabian Castle, Barletta, Barletta-Andria-Trani, 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
Castelo de Silves, Silves, Algrave, Portugal
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
Monnow Bridge and Gate over the River Monnow, Monmouth, Monmouthshire, Wales, United Kingdom, Europe
The Ruin of Newark Castle on the Fife Coast Path near St. Monans, Fife, Scotland, United Kingdom, Europe
Alhambra, UNESCO World Heritage Site, Granada, province of Granada, Andalucia, Spain, Europe
Alhambra, UNESCO World Heritage Site, Granada, Province of Granada, Andalusia, Spain, Europe
The gate of Castello Svevi, the 13th century castle built for King Frederick II, the Holy Roman Emperor, in Trani, Apulia, Italy, Europe
Viellevieille Castle, dating from the 11th century, with a Renaissance facade, in Villevieille, Gard, Languedoc-Roussillon, France, Europe
Fort St. Ivana, Dubrovnik, Croatia, Europe
Burg Kreuzenstein castle, Leobendorf, Weinviertel Region, Lower Austria, near Vienna, Austria, Europe
The fortress of Massangano, Cuanza Norte, Angola, Africa
The fortress of Massangano, Cuanza Norte, Angola, Africa
Golden sunrise over the village and castle at Corfe, Dorset, England, United Kingdom, Europe
Old fort in Al Wadj, Saudi Arabia, Middle East
Masmak fort, Riyadh, Saudi Arabia, Middle East
Masmak fort, Riyadh, Saudi Arabia, Middle East
Masmak fort, Riyadh, Saudi Arabia, Middle East
Old Fort, citadel in Tabuk, Saudi Arabia, Middle East
Sar Yazd fortress, Iran, Middle East
Sar Yazd fortress, Iran, Middle East
Sar Yazd fortress, Iran, Middle East
Narenj citadel, Nain city, Isfahan Province, Iran, Middle East
Narenj citadel, Nain city, Isfahan Province, Iran, Middle East
Narenj citadel, Nain city, Isfahan Province, Iran, Middle East
Black Fort, Inish More, Aran Islands, Republic of Ireland, Europe
Medieval Castle, Obidos, Oeste, Leiria district, Portugal, Europe
Castle Ramparts at Castelo de Obidos, Oeste, Leiria District, Portugal, Europe
Historic medieval Soutomaior Castle (Castelo de Soutomaior), Pontevedra, Galicia, Spain, Europe
Castel del Monte, octagonal castle, built for Emperor Frederick II in the 1240s, UNESCO World Heritage Site, Apulia, Italy, Europe
Al Murabbaa Heritage Fort, Al Ain, Abu Dhabi, United Arab Emirates, Middle East
Spiez Castle Church, Spiez, Canton of Bern, Switzerland
The harbour and Fort da Ponta da Bandeira in the Old Town of Lagos, Algarve, Portugal
Caserma Bergia, Bergia Barracks, Bari waterfront, Bari, Apulia, Italy
Norman-Swabian Castle, Barletta, Barletta-Andria-Trani, 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
Castle of Carlo V, Lecce, Salento, Apulia, Italy
Massafra Castle, Massafra, Taranto, Apulia, Italiy
Norman Swabian Aragonese Castle, Monte Sant'Angelo, UNESCO, Foggia, Apulia, Italy
Norman Swabian Aragonese Castle, Monte Sant'Angelo, UNESCO, Foggia, Apulia, Italy
Agra Fort at sunset, UNESCO World Heritage Site, Agra, Uttar Pradesh, India, Asia
Sar Yazd fortress, Iran, Middle East
Leeds Castle, Maidstone, Kent, England, United Kingdom, Europe
Cannon in historic castle in medieval village of Marvao, Portalegre district, Alto Alentejo, Portugal, Europe
Entrance to Al Murabbaa Heritage Fort, Al Ain, Abu Dhabi, United Arab Emirates, Middle East
Viana do Castelo, Minho-Lima, Portugal
Norman-Swabian Castle, Bari, Apulia, Italy
Norman-Swabian Castle, Bari, Apulia, Italy
Norman-Swabian Castle, Barletta, Barletta-Andria-Trani, Apulia, Italy
Castle of Charles V, Monopoli, Bari, Apulia, Italy
Castle of Carlo V, Lecce, Salento, Apulia, Italy
Swabian Castle, Trani, Barletta-Andria-Trani, Apulia, Italy
Massafra Castle, Massafra, Taranto, Apulia, Italiy
Norman Swabian Aragonese Castle, Monte Sant'Angelo, Foggia, Apulia, Italy
Coastal scenery and historic walls of the fort, Galle, UNESCO World Heritage Site, Sri Lanka, 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
Hever Castle and gardens, Hever, Kent, England, United Kingdom, Europe
St. Rules Tower at St. Andrews Cathedral, Fife, Scotland, United Kingdom, Europe
South East tower and eastern part of Llawhaden Castle, Pembrokeshire, Wales, United Kingdom, Europe
Defensive walls San Cibrao de Las hill fort, Castro Culture archeological site, San Amaro, Ourense, Galicia, Spain, Europe
Geese at Leeds Castle, Maidstone, Kent, England, United Kingdom, Europe
Leeds Castle, Maidstone, Kent, England, United Kingdom, Europe
Tower of David museum, the main courtyard, jerusalem Old City, Israel, Middle East
The 13th century medieval castle and gardens in Marvao, built by King Dinis, Marvao, Alentejo, Portugal, Europe