Travertine terraces of Pamukkale, Turkey (@ Ocean/Corbis)

Travertine terraces of Pamukkale, Turkey (@ Ocean/Corbis)

comments,

Driver-training course in Minnesota, U.S.A. (@ Richard Hamilton Smith/Corbis)

Driver-training course in Minnesota, U.S.A. (@ Richard Hamilton Smith/Corbis)

comments,

Surfer riding a wave near Pacific City, Oregon, U.S.A. (@ Gabe Rogel/Aurora Photos)

Surfer riding a wave near Pacific City, Oregon, U.S.A. (@ Gabe Rogel/Aurora Photos)

comments,

Stillaguamish River of Mount Baker-Snoqualmie National Forest, Washington, U.S.A. (@ Stephen Matera)

Stillaguamish River of Mount Baker-Snoqualmie National Forest, Washington, U.S.A. (@ Stephen Matera)

comments,

Bees in San Felice Circeo, Italy (@ Massimo Borchi/4Corners)

Bees in San Felice Circeo, Italy (@ Massimo Borchi/4Corners)

comments,

Bridge over the Loire River at Amboise, France (@ ESCUDERO Patrick/Hemis/Corbis)

Bridge over the Loire River at Amboise, France (@ ESCUDERO Patrick/Hemis/Corbis)

comments,

Svartifoss waterfall flanked by hexagonal basalt columns in Vatnajökull National Park, Iceland (@ Martin Moos/Lonely Planet Images)

Svartifoss waterfall flanked by hexagonal basalt columns in Vatnajökull National Park, Iceland (@ Martin Moos/Lonely Planet Images)

comments,