Ancient stone kiln in a rural field with a dry stone wall and overcast sky, North Yorkshire, England, United Kingdom, Europe

Old gold mine buildings, Rodalquilar, Cabo de Gata natural park, Almeria, Spain, Europe

Old gold mine buildings, Rodalquilar, Cabo de Gata natural park, Almeria, Andalusia, Spain, Europe

Old gold mine buildings, Rodalquilar, Cabo de Gata natural park, Almeria, Andalusia, Spain, Europe

Defensive walls San Cibrao de Las hill fort, Castro Culture archeological site, San Amaro, Ourense, Galicia, Spain, Europe

Santa Laura Salpeter mine, UNESCO World Heritage Site, Atacama desert, Chile, South America

Ta Prohm Temple, a Mahayana Buddhist monastery built in the late 12th century for Khmer king Jayavarman VII, Angkor, UNESCO World Heritage Site, Cambodia, Indochina, Southeast Asia, Asia

Wreck of a C-53 Skytrooper, which went down on February 26, 1942 in Vansittart Bay, Kimberley, Western Australia, Australia, Pacific

Santa Laura Salpeter mine, UNESCO World Heritage Site, Atacama desert, Chile, South America

Old houses in the old port town of Massawa, Eritrea, Africa

Santa Laura Salpeter mine, UNESCO World Heritage Site, Atacama desert, Chile, South America

Dolores Battlefield, Atacama desert, Chile, South America

Santa Laura Salpeter mine, UNESCO World Heritage Site, Atacama desert, Chile, South America

Humberstone Saltpeter Works, UNESCO World Heritage Site, northern Atacama, Chile, South America

Views of the cemetery at the abandoned whaling station in Stromness Bay on South Georgia in the Southern Ocean, Polar Regions

Wreck of a C-53 Skytrooper, which went down on February 26, 1942 in Vansittart Bay, Kimberley, Western Australia, Australia, Pacific

Humberstone Saltpeter Works, UNESCO World Heritage Site, northern Atacama, Chile, South America

Old Russian transport airplane, now used as a coffee shop, Massawa, Eritrea, Africa

Wreck of a C-53 Skytrooper, which went down on February 26, 1942 in Vansittart Bay, Kimberley, Western Australia, Australia, Pacific

Remains of the baptistery, Archaeological site of Butrint, Butrint National Park, UNESCO World Heritage Site, near Saranda, on the Ionian coast, Albania, Europe

Humberstone Saltpeter Works, UNESCO World Heritage Site, northern Atacama, Chile, South America

Ruined bombed house in the old port town of Massawa, Eritrea, Africa

Humberstone Saltpeter Works, UNESCO World Heritage Site, northern Atacama, Chile, South America

Roman town of Herculaneum, UNESCO World Heritage Site, Campania, Italy, Europe

Temple to Sobek, the crocodile god, and Harwer, the falcon diety at Kom Ombo, Egypt.