In the southern cost of Sicily, the largest island in the Mediterranean Sea, lies the town of Realmonte where there is a huge underground sa...

Strataca/The Kansas Underground Salt Museum is one of the 8 Wonders of Kansas. Located 650 feet beneath the earth's surface in a salt bed formed 275...

West Virginia is known for its breathtaking mountains, but some of its most fascinating sights can be found tucked into a hillside or buried far beneath