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Explore 21 15, Cloud Formations and more!

Travertine terrace formations at Pamukkale, Anatolia, Turkey ~ The water which flows from numerous hot springs is rich in calcium carbonate, which deposits on the surface and hardens into a form of limestone known as travertine. These formations are protected as a UNESCO World Heritage Site. (photographer Mikel Bilbao) #travel

6/21/15 Wall cloud moving fast over Shepherd, Montana! Gusty winds, pea size hail and a down pour! Didn't last very long!

Classic Supercell near Heinsberg, Germany on July 21st 2009. Overview shot of the whole Meso from approx. 15 miles further to the east at Kirchtroisdorf, Germany.