The remains of a magnificent medieval fortress that was the capital of a vast empire.

A delightful park featuring homemade scale replicas of dinosaurs, tucked away in the Tennessee mountains.

This maze-like slot canyon is a unique gem within an already fascinating geological area.

A volcanic landmark located on an Ice age lake bed.

Sunset-colored dunes of volcanic ash make taking a poor photo impossible.

Each winter this underground cave forms a dazzling ice palace.

A petroglyph map of the upper Snake River carved by prehistoric hunter-gatherers.

A volcanic fissure over two miles long and up to 70 feet deep.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

Mine your own precious stones.

Golden plates containing what would become the Book of Mormon were believed to be buried on this New York hillside.

Surprisingly aquamarine waters fill deep lakes formed at the end of the last ice age.

The quarry was abandoned over 100 years ago, after a massive ammunition explosion ended in tragedy.

Louise Bourgeois' 30-foot-tall steel spider sculpture.

A castle built for love, and abandoned due to heartbreak.

A sweet museum focused on beets.

A fascinating insight into daily life in the Eastern Bloc.

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

The cluster of boulders near Fort Irwin is covered in military insignia.

This graveyard is the eternal home of the residents of a vanished California town.

This impressive tunnel was dug entirely by hand over the course of 36 years.

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.

Abandoned Air Force base that has fallen into disrepair.

This strangely vacant Western amusement seems to be an empty tribute to residents of Lucerne Valley.