The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

One of the oldest living oak trees in the Southeast.

The remains of a chapel created for convenience.

The ruins of an ancient island city built atop a coral reef in the South Pacific are spectacular and strange enough to have inspired H.P. Lovecraft.

Ruins of a Carnegie family mansion on Cumberland Island.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

Erosion and time have created a naturally-formed water park.

A limestone wonderland of water and subterranean secrets.

Enchanting cave with a river crashing through the roof.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

Once thought to be the mysterious work of a witchy prophetess, a well with unusual properties turns objects into "stone".

The oldest continual pilgrimage site in Britain was supposedly created by a gruesome beheading.