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The Mosque of Sultan Ibrahim within the Fortezza, or castle, in Rethymnon, Crete, Greek Islands, Greece, Europe

View along the rampart walls to Flag Rock, one of the former Portuguese bastions at the old Dutch Fort, UNESCO World Heritage Site, Galle, Sri Lanka, Asia

The imposing red sandstone Agra Fort with kites flying overhead, UNESCO World Heritage Site, Agra, Uttar Pradesh, India, Asia

San Pedro de la Roca Castle, UNESCO World Heritage Site, Santiago de Cuba, Santiago de Cuba Province, Cuba, West Indies, Caribbean, Central America

San Pedro de la Roca Castle, UNESCO World Heritage Site, Santiago de Cuba, Santiago de Cuba Province, Cuba, West Indies, Caribbean, Central America

Woman hiding in the entranceway of Mehrangarh Fort in Jodhpur, the Blue City, Rajasthan, India, Asia

A gate at the Imperial Citadel, Hue, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia

Gates at the Imperial Citadel, Hue, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia

Caernarfon Castle, UNESCO World Heritage Site, Caernarfon, Gwynedd, North Wales, Wales, United Kingdom, Europe

Tourists standing in the main gate of Mehrangarh Fort in Jodhpur, the Blue City, Rajasthan, India, Asia

Captain Francis Light statue at Fort Cornwallis in Georgetown, Penang, Malaysia, Southeast Asia, Asia

Doonagore Castle between the village of Doolin and the Cliffs of Moher on the County Clare coast, County Clare, Munster, Republic of Ireland, Europe

Fortified castle walls around the Convent of Christ (Convento de Cristo), UNESCO World Heritage Site, Tomar, Ribatejo, Portugal, Europe

White-footed Sportive Lemur (Lepilemur leucopus), Berenty Nature Reserve, Fort Dauphin, Toliara Province, Madagascar, Africa

Evening view from Shanti Stupa to the Namgyal Tsemo fort and monastery (gompa), Leh, Ladakh, India, Asia

Verreaux's sifaka (Propithecus verreauxi) on a tree, Berenty Nature Reserve, Fort Dauphin, Toliara Province, Madagascar, Africa

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

The Jacobite steam train on the Glenfinnan Viadust on the Fort William to Mallaig Railway, Highlands, Scotland, United Kingdom, Europe

Elevated view over Korcula's picturesque Stari Grad (Old Town) illuminated at dusk, Korcula Town, Korcula, Dalmatia, Croatia, Europe

Trogir's historic Stari Grad (Old Town) defensive walls and harbour, Trogir, Dalmatia, Croatia, 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 view from the main courtyard of Mehrangarh Fort towering over the blue rooftops in Jodhpur, the Blue City, Rajasthan, India, Asia

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

The ancient mud brick buildings of Kasbah Ait Benhaddou bathed in golden morning light, UNESCO World Heritage Site, near Ouarzazate, Morocco, North Africa, Africa

The ancient mud brick buildings of Kasbah Ait Benhaddou bathed in evening light, UNESCO World Heritage Site, near Ouarzazate, Morocco, North Africa, Africa

Iron-age British Camp hill fort and the Malvern Hills in autumn, Great Malvern, Worcestershire, England, United Kingdom, Europe

The ancient mud brick buildings of Kasbah Ait Benhaddou bathed in golden morning light, UNESCO World Heritage Site, near Ouarzazate, Morocco, North Africa, Africa

Caernarfon Castle at night, UNESCO World Heritage Site, Caernarfon, Gwynedd, North Wales, Wales, United Kingdom, Europe

Aerial view of Rethymno old town, Venetian Harbour and fortress, Crete Island, Greek Islands, Greece, Europe (Drone)

Fort McClary State Historic Site, Kittery, Kittery Point, Maine, New England, United States of America, North America

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

Edinburgh Castle, historic fortress, UNESCO World Heritage Site, Castle Rock, Castlehill, Edinburgh Old Town, Midlothian, Scotland, United Kingdom, Europe

Edinburgh Castle, historic fortress, Castle Rock, Castlehill, Edinburgh Old Town, UNESCO World Heritage Site, Midlothian, Scotland, United Kingdom, Europe

Dunbeg Promontory Fort, Slea Head Drive, Dingle Peninsula, Wild Atlantic Way, County Kerry, Munster, Republic of Ireland, Europe

Dunbeg Promontory Fort, Slea Head Drive, Dingle Peninsula, Wild Atlantic Way, County Kerry, Munster, Republic of Ireland, Europe

Dunbeg Promontory Fort, Slea Head Drive, Dingle Peninsula, Wild Atlantic Way, County Kerry, Munster, Republic of Ireland, Europe

Skala du Port, Fort, 18th century ramparts, Essaouira, Morocco, Atlantic Coast, North Africa, Africa

A winter view looking across Moine Mhor Nature Reserve from Dunadd Fort in the Scottish Highlands, Argyll, Scotland, United Kingdom, Europe

A winter view looking across Moine Mhor Nature Reserve from Dunadd Fort in the Scottish Highlands, Argyll, Scotland, United Kingdom, Europe

Wintery scene of Loch Linnhe, near Fort William, in calm weather with reflections, Highlands, Scotland, United Kingdom, Europe