Pamukkale, Turkey Pamukkale, meaning "cotton castle" in Turkish, is a natural site in Denizli Province in southwestern Turkey. The city contains hot springs and travertines, terraces of carbonate minerals left by the flowing water
Ice cave in the Skaftafell National Park in Iceland. Ice caves collapse and new ones form as each glacier grinds slowly towards the sea. Local guides can help you (without dying) find one. (Visit Skaftafell National Park in Iceland.
Jason de Caires Taylor& underwater sculpture garden in Cancun. "Constructed out of concrete and steel, and bolted to the ocean substrate, the works here act as artificial reefs that provide & ideal habitat for filter feeding organisms.
See Baatara Gorge Waterfall's three natural bridges
The Baatara gorge waterfall (also known as the “Cave of the Three Bridges”) in Tannourine, Lebanon. The waterfall drops 255 metres ft) into the Baatara Pothole, a cave of Jurassic limestone located on the Lebanon Mountain Trail.