This public baseball field is a beloved remainder from of one of the most historic stadiums in the country.

Opulent downtown movie theater now houses cars as an indoor parking garage.

Remnants of a storybook amusement park hidden behind a strip mall.

What was once one of the country's largest confectionary plants is now an abandoned ruin, but is still pretty sweet.

The ruins of a cotton mill that was burned in the Civil War are still hidden in a Georgia forest.

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

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

A museum dedicated to the alleged Roswell Incident.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

A futuristic temple of light uses prisms and rainbows to create an atmosphere of peace.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

A multi-storied adobe complex has been inhabited for more than a thousand years.

Fighting the British and making game shows for over 150 years.

This complex of vertically-excavated Buddhist, Jain, and Hindu monolithic temples in India's Maharashtra providence illustrates a spirit of tolerance characteristic of ancient India.

A nearly unconquerable island-fort in the Indian Ocean.

An extraordinary "City of Caves" carved from solid stone.

Ancient human, animal, and geometric figures drawn in the earth.

America's most famous piece of self-built architecture.

Another of California's unused Cold War missile defense complexes has become a graffiti gallery.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.