More than 21,000 images fill this overlooked gem of a prehistoric site.

A cave's rare beauty held a cavernous secret hidden underground.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

The remains of a 19th century spring, and the site of an infamous unsolved murder.

This abandoned Poconos resort is haunted by a history of kitschy romance and a violent fugitive.

A museum dedicated to exhibiting remarkable outsider art.

Rumors of the occult haunt this upscale 1920s hotel.

Whimsical artist house in the New Jersey woods.

Here, exhibits come with a side of edible history.

A "Bugseum" dedicated to all things insect-related resides behind a pest control company.

This museum boasts a bucket of teeth and tells the tale of a 20th-century dental circus.

A small Chicago museum filled with thousands of preserved butterflies, beetles, and more.

A professional special effects makeup artist’s collection of horror creatures and one-of-a-kind recreations on display in downtown Boulder City.

This museum dedicated to the history of the medical bone trade and human osteology.

The only Leonardo Da Vinci painting in the Western Hemisphere.

Site of a famous 19th-century transcendentalist utopian community, now abandoned.

Two thousand artifacts from around the world collected by one woman who loved to travel.

This seaworthy collection was sparked by one man's passion for sailing.

A little bit Wonkatania, a little bit pink elephant.

One man's homage to the orange as realized through a long-term folk art labor of love.

Ruins of a once-opulent grand Victorian resort.

This eclectic Austin curiosity shop is home to all things strange and unusual.

This eclectic, mosaic-clad home includes a bamboo ping-pong loft and a "Whispermaphones" intercom.

A Prada store in the West Texas desert that is never open for business.