This canyon is comprised of gorgeous waters and magnificent basalt columns.

One of the deepest springs in Missouri.

A 40-foot waterfall flows into this unique natural swimming hole.

The birthplace of both the Atomic Age and Godzilla, and the namesake of the bathing suit.

"Not too many people can say they've had a nuclear bomb dropped on them, not too many would want to." — Walter Gregg.

An enormous concrete structure built over a nuclear crater.

The largest man-made crater in the U.S. marks the spot where we once tested mining with nukes.

This largely forgotten piece of Cold War history stands hidden in the woods just north of the Mississippi Gulf Coast.

A facility built in 1992 for an underground nuclear test remains in place today.

This hunter-gatherer architecture is believed to be the oldest religious complex known.

This statue standing near Sweden's southernmost point was based on the grandmother of a modern movie star.

Each winter this underground cave forms a dazzling ice palace.

This eccentric cave dwelling is bizarre even by the standards of a subterranean town.

This natural French spring has been turned into a magical grotto by Roman and medieval constructions.