One of the few petrified trees almost intact, The Onyx Bridge in Petrified Forest National Park, Arizona, United States of America, North America

One of the few petrified trees almost intact, The Onyx Bridge in Petrified Forest National Park, Arizona, United States of America, North America

One of the few petrified trees almost intact, The Onyx Bridge in Petrified Forest National Park, Arizona, United States of America, North America

Waterfall, Val Martello, Stilfser Joch National Park, Alto Adige, South Tyrol, Italy

View over Faelensee (Lake Faelen), Alpstein Massif, Swiss Alps, Appenzell Innerrhoden Canton, Switzerland

Bernina Range with Mount Piz Bernina, 4048 metres above sea level, and Mount Piz Morteratsch, 3751 metres above sea level, Buendner Alps, Canton of Graubuenden, Switzerland, Europe

Ice floes on the Baltic Sea off Stein, Probstei, Ploen district, Schleswig-Holstein, Germany, Europe