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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
Castel del Monte, octagonal castle, built for Emperor Frederick II in the 1240s, UNESCO World Heritage Site, Apulia, Italy, Europe
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
Lombardia Castle, Enna, Sicily, Italy, Mediterranean, Europe
Fortress of Frederick II of Swabia, Castel del Monte, Andria, Western Murge, Barletta, Apulia, Italy, 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
St. Mawes Castle and coastline, St. Mawes, Cornwall, England, United Kingdom, 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
Monnow Bridge and Gate over the River Monnow, Monmouth, Monmouthshire, Wales, United Kingdom, 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
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
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
Medieval Castle, Obidos, Oeste, Leiria district, Portugal, Europe
Castle Ramparts at Castelo de Obidos, Oeste, Leiria District, Portugal, Europe
Fortified Ibiza Old Town (Dalt Vila), UNESCO World Heritage Site, Ibiza, Balearic Islands, Spain, Europe
Old fort in Al Wadj, Saudi Arabia, Middle East
Al Murabbaa Heritage Fort, Al Ain, Abu Dhabi, United Arab Emirates, Middle East
Rumeli Hisari (Fortress of Europe) and Fatih Sultan Mehmet Suspension Bridge, Hisarustu, Bosphorus Strait, Istanbul, Turkey, Europe
The Ruin of Newark Castle on the Fife Coast Path near St. Monans, Fife, Scotland, United Kingdom, Europe
San Sebastian Fort, City of Sao Tome, Sao Tome and Principe, Atlantic Ocean, Africa
The whitewashed city wall, including a defensive tower, in the white city (Citta Bianca), Ostuni, Apulia, Italy, Europe
Entrance to Al Murabbaa Heritage Fort, Al Ain, Abu Dhabi, United Arab Emirates, Middle East
Historic castle, medieval village of Marvao, Portalegre district, Alto Alentejo, Portugal, Europe
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
Fort San Felipe de Lara, Rio Dulce, Guatemala, Central America
Sar Yazd fortress, Iran, Middle East
Black Fort, Inish More, Aran Islands, Republic of Ireland, Europe
Leeds Castle, Maidstone, Kent, England, United Kingdom, Europe
Guide talking to tourists at the Inca fortification of Sacsayhuaman, near Cuzco, Peru, South America
Hever Castle and gardens, Hever, Kent, England, United Kingdom, Europe
Ait-Benhaddou Kasbah, Morocco, North Africa
Al Murabbaa Heritage Fort, Al Ain, Abu Dhabi, United Arab Emirates, Middle East
Alhambra, UNESCO World Heritage Site, Granada, province of Granada, Andalucia, Spain, Europe
Sar Yazd fortress, Iran, Middle East
Geese at Leeds Castle, Maidstone, Kent, England, United Kingdom, Europe
Tower of David museum, the main courtyard, jerusalem Old City, Israel, Middle East
Agra Fort at sunset, UNESCO World Heritage Site, Agra, Uttar Pradesh, India, Asia
Defensive walls San Cibrao de Las hill fort, Castro Culture archeological site, San Amaro, Ourense, Galicia, Spain, Europe
Historic medieval Soutomaior Castle (Castelo de Soutomaior), Pontevedra, Galicia, Spain, 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
Kidwelly Castle, Carmarthenshire, Wales, United Kingdom, Europe
Fort Diamant, Cayenne, French Guiana, Department of France, South America
Cannon in historic castle in medieval village of Marvao, Portalegre district, Alto Alentejo, Portugal, Europe
Sultan Bin Zayed Fort, now the Al-Ain Museum, Al Ain, Abu Dhabi, United Arab Emirates, Middle East
St. Rules Tower at St. Andrews Cathedral, Fife, Scotland, United Kingdom, 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
Old watchtower Baluarte de San Diego, Intramuros, Manila, Luzon, Philippines, Southeast Asia, Asia
Leeds Castle, Maidstone, Kent, England, United Kingdom, Europe
Rustic stone ruins in a green countryside under a cloudy sky, North Yorkshire, England, United Kingdom, Europe
Castle of Xativa (Jativa), Valencia province, Spain, Europe
Castle of Xativa (Jativa), Valencia province, Spain, Europe
Stone walled city and St. Paul's Cathedral, Mdina, Malta, Mediterranean, Europe
The 13th century medieval castle and gardens in Marvao, built by King Dinis, Marvao, Alentejo, Portugal, Europe
Spanish colonial fortification, Fort de San Felipe, Bacalar, Quintana Roo, Yucatan Peninsula, Mexico, North America
Historic medieval Soutomaior Castle (Castelo de Soutomaior), Pontevedra, 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
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.
Historic castle, medieval village of Marvao, Portalegre district, Alto Alentejo, Portugal, Europe
Castle of Castillo de San Felipe, Los Escullos, Cabo de Gata natural park, Almeria, Andalusia, Spain, Europe
Rumeli Hisari (Fortress of Europe or Rumelihisari), elevated view from the Bosphorus Strait, Hisarustu, Istanbul, Turkey, Europe
City gate, Mdina, Malta, Mediterranean, Europe
South East tower and eastern part of Llawhaden Castle, Pembrokeshire, Wales, United Kingdom, Europe
Tower of Mangana (Torre Mangana), on site of Moorish city, Cuenca, Castille La Mancha, Spain, Europe
Amberd fortress located on the slopes of Mount Aragats, with Mount Ararat in the distance, Yerevan, Aragatsotn, Armenia, Central Asia, Asia
Sigiriya Rock, tourist enjoying the view over the Sri Lankan landscape, Sri Lanka, Asia
Historic walled castle in hilltop village of Monsaraz, Alto Alentejo, Portugal, Europe
Historic walled castle in hilltop village of Monsaraz, Alto Alentejo, Portugal, Europe
Cannons on ramparts of citadel castle Il-Kastell, Victoria Rabat, Gozo, Malta, Mediterranean, Europe
Burgergarde fort and city walls, Monchsberg Hill, Salzburg, Austria, Europe
Fort Fincastle, Nassau, New Providence, Bahamas, Caribbean