Stream at Muir Woods

Going Down Guardsman Pass during the Fall in Utah OC

Hang son doong, Vietnam

Hume Lake, Sequoia National Forest of Fresno County, California by Lou Lu

Great Smoky Mountains, Tennessee

Blue Caves, Zakynthos, Greece

The Sierra Nevadas in the Springtime

Painted Desert, John Day Fossil Beds National Monument

Golden and green countryside in the farmlands of Palouse, Washington

Canyon from central Turkey near Göreme.

Valle Los Gigantes, Córdoba, Argentina

Ruins of Whitby Abbey Monastery. North Yorkshire, England

Caved in cave. Devetashka, Bulgaria.