Caliche walls made from limy subsoil, not adobe, dating from 14th century, Casa Grande, Hohokam Indians, Arizona, United States of America (U.S.A.), North America.

Travertine terraces of Pamukkale, Turkey

Mammoth Hot Springs, Yellowstone Nationalpark, Wyoming, USA, United States of America

Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA, United States of America

Mammoth Hot Springs, Yellowstone Nationalpark, Wyoming, USA, Vereinigte Staaten von Amerika