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Looking across Embleton Bay at sunrise towards the silhouetted ruins of Dunstanburgh Castle in the distance and the vivid colours in the sky reflecting in the sea and wet sand, Embleton, near Alnwick, Northumberland, England, United Kingdom

Long exposure to record motion in the sea as it washes around black basalt boulders on a beach at Embleton Bay with the silhouette of Dunstanburgh Castle in the distance, Embleton Bay, near Alnwick, Northumberland, England, United Kingdom, Europe

Aerial view by drone of Rethymno old town, Venetian Harbour and fortress, Crete Island, Greek Islands, Greece, Europe

Trogir's historic Stari Grad (Old Town) defensive walls and harbour, Trogir, Dalmatia, Croatia, 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

The Kings Tower at Knaresborough Castle in the snow Knaresborough, Yorkshire, England, United Kingdom, Europe

The Kings Tower at Knaresborough Castle in the snow Knaresborough, Yorkshire, England, United Kingdom, Europe

Giant statue of Mubarek Ahmed Sharafaddin in front of the citadel of Erbil (Hawler), capital of Iraq Kurdistan, Iraq, Middle East

Hvar Town and tourists at Hvar Spanish Fort (Fortica) at sunset, Hvar Island, Dalmatian Coast, Adriatic, Croatia, Europe

Fort Lovrijenac (St. Lawrence Fortress) at sunrise, 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

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

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

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

Amboise Gate, Grand Master's Palace, City of Rhodes, UNESCO World Heritage Site, Rhodes, Dodecanese, Greek Islands, Greece, Europe

The colorful castle of Palacio da Pena, UNESCO World Heritage Site, on top of hill Sao Pedro de Penaferrim, Sintra, Lisbon district, Portugal, Europe

Bayard's Cove Fort and the River Dart estuary in spring sunshine, Dartmouth, South Devon, England, United Kingdom, Europe

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

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

Meeran Jumma Mosque and the lighthouse at the Point Utrecht Bastion in the old Dutch Fort, UNESCO World Heritage Site, Galle, Southern Province, 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

Wawel Castle, UNESCO World Heritage Site, reflected in the Vistula River, at sunrise, Krakow, Poland, Europe

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

Artillery at Forte de Copacabana (Copacabana Fort), Copacabana, Rio de Janeiro, Brazil, South America

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

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