The Blue Lagoon geothermal spa is one of the most visited attractions in Iceland. The steamy waters are part of a lava formation. The spa is located in a lava field in Grindavík on the Reykjanes Peninsula, southwestern Iceland.
"THE COTTON CASTLE" in Turkey - Pamukkale, Turkey. This is a natural attraction in southwestern Turkey. Snow white terraces are made of travertine, a sedimentary rock that is deposited by water flowing from the hot springs.