Salt-pans dating back to Roman times on the west coast of the island of Gozo, Malta

Remains of the Tuna fishery plant, Vendicari, Noto Valley, Sicily, Italy

Skara Brae, a Neolithic village constructed in 3100 BC, UNESCO, Orkney Islands, Scotland, United Kingdom

Views of the wreck of the Guvernoren, a 20th century whale processing ship, in the Enterprise Islands, Antarctica, Polar Regions

Wandjina art form of various animals on King Leopold Sandstone, Swift Bay, Kimberley, Western Australia, Australia, Pacific

View of the interior of Mousa Broch on Mousa Island in Shetland, Scotland, United Kingdom

King Henry VIII's ship, Mary Rose, Portsmouth, Hampshire, England, United Kingdom, Europe

Ocean waves on beach

Temple of Poseidon ruins under blue sky, Cap Sunion, Greece

Temple of Poseidon ruins under blue sky, Cap Sunion, Greece

Jarlshof, an archaeological site on the Shetland Islands, which was inhabited from neolithic times to the middle ages.Wheelhouses dating back to the Iron Age. Europe, Great Britain, Scotland, Northern Isles, Shetland, May

Jarlshof, an archaeological site on the Shetland Islands, which was inhabited from neolithic times to the middle ages.Wheelhouses dating back to the Iron Age. Europe, Great Britain, Scotland, Northern Isles, Shetland, May

Dun Carloway Broch (Doune Carlabhagh) dating back to the Iron Age, a landmark of the Isle of Lewis. Europe, Scotland, June

Young boy runs down dock on the Caribbean Island of Cubagua in Venezuela.