Scotland's Fingal's Cave in the inner Hebrides islands is also called the "Cathedral of the Sea," and is a wondrous art ...

Kartchner Caverns State Park is like nature’s own subterranean art gallery, complete with stalactites, stalagmites, and enough “oohs” and “aahs” to fill a cavern. This hidden gem was kept secret for ...

Welcome to Arizona, where Mother Nature went all out with her crayons and sculpting tools ... The formations are so otherworldly that you half expect to see aliens peeking out from behind a column.