View of Unfinished Obelisk in Aswan quarry on a sunny day, Aswan, Nubia, Egypt, North Africa, Africa

Petroglyphic Staircase at the Temple of Five Floors, detailed view, Great Acropolis, Edzna Archaeological Site, Campeche State, Mexico

Dredging the harbor on remote Heimaey Island, Iceland

Mnajdra Temple, on the island of Malta

View of Unfinished Obelisk in Aswan quarry on a sunny day, Aswan, Nubia, Egypt, North Africa, Africa

Conservation work at the Great Hypostyle Hall in the Precinct of Amon-Re, Karnak Temple Complex, UNESCO World Heritage Site, Luxor, Egypt, North Africa, Africa

Archaeologists at work, Chichen Itza, UNESCO World Heritage Site, Yucatan, Mexico, North America

Archaeologists at work, Chichen Itza, UNESCO World Heritage Site, Yucatan, Mexico, North America

Lignite strip mining Cottbus Nord, Lausitz, Brandenburg, Germany, Europe

Lignite strip mining Cottbus Nord, Lausitz, Brandenburg, Germany, Europe