8. Badab-e Surt – Iran
Badab-e Surt is a natural site consisting of travertine terrace that have formed over thousands of years. Located in Iran, it’s one of the world’s rarest and most beautiful wonders.
The orange colors of the travertine formations is due to the large concentration of iron oxide. The two mineral hot springs that are located there have many medicinal properties due to its salt content.