HALONG BAY in Vietnam: Thousands of limestone karsts jut skyward from emerald waters in this UNESCO World Heritage-listed seascape. The best way to see it is to hop by boat between islands, including scenic Cat Ba, home to a national park.
The mountain lies on the border of three countries: Brazil, Guyana and Venezuela. The peak of the mountain is considered as one of the oldest geological formations in the world. - 7 Most Mysterious Places on Earth
For thousands of years, people have been drawn to the hot springs and carbonate mineral terraces (travertines) of Pamukkale, in southwestern Turkey. The name means "cotton castle" in Turkish and indeed looks like a scene from a fairy tale.