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Fort Lovrijenac (St. Lawrence Fortress) and the coastline from the Old City Walls, Dubrovnik, Dalmatian Coast, Adriatic, Croatia, Europe

Dubrovnik and the City Walls at sunrise, from Fort Lovrijenac (St. Lawrence Fortress), Dubrovnik, Dalmatian Coast, Adriatic, Croatia, Europe

The walls and a guard turret in the medieval Fortezza, or castle, in Rethymnon, Crete, Greek Islands, Greece, Europe

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

Fortress Fortaleza San Felipe, Puerto Plata, Dominican Republic, West Indies, Caribbean, Central America

View of a section of the Great Wall, UNESCO World Heritage Site, between Jinshanling and Simatai near Beijing, China, Asia

The city wall of Mehrangarh Fort towering over the blue rooftops in Jodhpur, the Blue City, Rajasthan, India, Asia

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

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

Sunrise and Hadrian's Wall National Trail in winter, looking to Housesteads Fort, Hadrian's Wall, UNESCO World Heritage Site, Northumberland, England, United Kingdom, Europe

Blue domed mosque minaret, Oman, Middle Easti National Flag and Al-Mirani Fort, Old Muscat, Oman, Middle East

The palace walls of Mehrangarh Fort towering over the blue rooftops in Jodhpur, the Blue City, Rajasthan, India, Asia

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

Aerial image of Housesteads Roman Fort of Vercovicium, an auxiliary fort on Hadrian's Wall, UNESCO World Heritage Site, Northumberland, England, United Kingdom, Europe

Empty road leading through stone gateways under a cloudy sky, North Yorkshire, England, United Kingdom, Europe

Dubrovnik Old Town and the City Walls at sunrise, from Fort Lovrijenac (St. Lawrence Fort), Dubrovnik, Dalmatian Coast, Adriatic, Croatia, Europe

Extensive remains of the bath site which included changing rooms, hot rooms and cold plunge pools, on the edge of what is now the River North Tyne, dating from AD138, Cilurnum (Chesters Roman Fort), Hadrian's Wall, UNESCO World Heritage Site, Chollerford, Northumbria National Park, England, United Kingdom, Europe

Old Inverlochy Castle and Ben Nevis, Inverlochy, Fort William, Lochaber, Scotland, United Kingdom, Europe

Motorised rickshaw by fort walls inside the historic town of Galle, UNESCO World Heritage Site, Sri Lanka, Asia

Sunrise on Hadrian's Wall National Trail in winter, looking to Housesteads Fort, Hadrian's Wall, UNESCO World Heritage Site, Northumberland, England, United Kingdom, Europe

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

Fortress Fortaleza San Felipe, Puerto Plata, Dominican Republic, West Indies, Caribbean, Central America

Muralhas de Sao Sebastiao (walls of St. Sebastian), fortress constructed to defend the bay of Porto Paim, and the marina, Horta, island of Faial, with Pico mountain on the island of Pico in the distance, Azores, Portugal, Atlantic, Europe

Walled and turreted fortress of Cite, Carcassonne, UNESCO World Heritage Site, Languedoc, France, Europe

View along the restored section of the Great Wall, UNESCO World Heritage Site, Mutianyu, near Beijing, China, Asia

Dubrovnik and the City Walls, UNESCO World Heritage Site, from Fort Lovrijenac, Dubrovnik, Dalmatian Coast, Croatia, Europe

Large wrought stones recovered from the site of the Roman Bridge that spanned the River North Tyne dating from AD 13, Cilurnum (Chesters Roman Fort), Hadrian's Wall, UNESCO World Heritage Site, Chollerford, Northumbria National Park, England, United Kingdom, Europe

D'Estr•À?es Fort now a museum of slavery, Goree Island, UNESCO World Heritage Site, near Dakar, Senegal, West Africa, Africa

Tourist on Dubrovnik City Walls, with Fort Lovrijenac (St. Lawrence Fortress) in the background, Dubrovnik, Dalmatian Coast, Adriatic, Croatia, Europe

Sunrise and Hadrian's Wall National Trail in winter, looking to Housesteads Fort, Hadrian's Wall, UNESCO World Heritage Site, Northumberland, England, United Kingdom, Europe

Commissioner's House and part of the old fort wall at the Royal Naval Dockyard, Bermuda, Central America

Old cannon, Ramparts of San Felipe Fort, built in 1733, Laguna Bacalar, Quintana Roo, Mexico, North America

Dubrovnik Old Town and the City Walls, UNESCO World Heritage Site, from Fort Lovrijenac, Dubrovnik, Dalmatian Coast, Croatia, Europe

Storage alcoves in the changing room of the Roman Baths, dating from AD 138, Cilurnum (Chesters Roman Fort), Hadrian's Wall, UNESCO World Heritage Site, Chollerford, Northumbrian National Park, England, United Kingdom, Europe

Minceta Fort and Old Town Walls at dusk, UNESCO World Heritage Site, Dubrovnik, Dalmatia, Croatia, Europe

Castle of Lykourgos Logothetis, Pythagorio, Samos, North Aegean Islands, Greek Islands, Greece, Europe

Old cannon, Ramparts of San Felipe Fort, built in 1733, Laguna Bacalar, Quintana Roo, Mexico, North America

Harbour and Old City Walls at dusk, UNESCO World Heritage Site, Dubrovnik, Dalmatia, Croatia, Europe

Porte d'Aude through outer wall of old city, Carcassonne, UNESCO World Heritage Site, Languedoc, France, Europe

Castillo de San Marcos, St. Augustine, oldest continuously occupied European-established settlement, Florida, United States of America, North America

Franciscan Monastery and Dubrovnik City Walls, UNESCO World Heritage Site, from Fort Lovrijenac, Dubrovnik, Dalmatian Coast, Croatia, Europe

View of a section of the Great Wall, UNESCO World Heritage Site, between Jinshanling and Simatai near Beijing, China, Asia

Ses Taules Gate, Old Town (Dalt Vila), UNESCO World Heritage Site, Ibiza town, Ibiza, Balearic Islands, Spain, Europe

Dubrovnik Old Town and the City Walls, UNESCO World Heritage Site, from Fort Lovrijenac, Dubrovnik, Dalmatian Coast, Croatia, Europe

Hue Citadel Gates, The Imperial City, Hue, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia

Hue Citadel Gates, The Imperial City, Hue, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia

Dubrovnik Old Town and the City Walls, UNESCO World Heritage Site, from Fort Lovrijenac, Dubrovnik, Dalmatian Coast, Croatia, Europe

Large wrought stones recovered from the site of the Roman Bridge that spanned the River North Tyne dating from AD 138, Cilurnum (Chesters Roman Fort), Hadrian's Wall, UNESCO World Heritage Site, Chollerford, Northumbria National Park, England, United Kingdom, Europe