The Humid Tropics biome at the Eden Project, a huge global garden with large hot houses opened in 2001 in a china clay pit, near St Austell, Cornwall, England, United Kingdom, Europe

Sunken irori fire pit inside the Kyu Uchiyamake historic Samurai house in Echizen-Ono, Fukui, Japan, Asia

Morocco, Historical City Of Fes, Elevated View Over The Tanners Souk (Market) Where Skins Are Treated

A pit house, part of an excavated ancient Anasazi village at the Anasazi State Park Museum, the site dates to the 12th century, Boulder, Utah, USA

Mansion, La Tene culture, Celtic village Gabreta, Lichtenau near Ringelai, Bavarian Forest, Lower Bavaria, Bavaria, Germany, Europe

From Pit to Port, bronze statue by John Clinch, Jon Buck, Roath Basin, Waterfront Park, Cardiff Bay, Cardiff, Caerdydd, South Glamorgan, Wales, United Kingdom, Europe

Open fireplace in a Hessian farmhouse, Hessenpark outdoor museum near Neu-Anspach, Hochtaunuskreis district, Hesse, Germany, Europe

Historical brine handling system in the Salinenpark park, Bad Rappenau, Neckar, Baden-Wuerttemberg, Germany, Europe

Historical brine handling system in the Salinenpark park, Bad Rappenau, Neckar, Baden-Wuerttemberg, Germany, Europe

Stone and turf structure with wooden doorway at the recreated longhouse in Greenland's Brattahlid, Eriksfjord area, part of a reconstruction of Erik the Red's settlement, Kujataa World Heritage Site, Qassiarsuk, Southern Greenland, Greenland