A 140-year-old castle with underground caves hidden in San Francisco.

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

Medicinal spa created with the discharge from a geothermal energy plant.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

On the Oregon coast there is a natural hole that seems to be draining the sea.

A psychedelic labyrinth on the San Francisco bay.

A magical place that lets you play in and explore the world of Studio Ghibli.

World's largest collection of serial killer artwork and other macabre exhibits.

On Japan's Tashirojima Island, cats are king.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

A huge musical instrument played by the ocean.

An emporium for the weird, creepy, rare, and just plain gross.

10,000 flowered plants bloom in the City of Roses.

A historic house in St. Louis was plagued by a series of suicides committed by family members involved in a successful brewery.

The red brick house where the father of rock 'n' roll wrote some of his classic hits.

A kitschy, creepy St. Louis mainstay.

Quirky water tower advertises the long-gone Brooks Tomato Products Co.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

The world's largest man-made underground caverns offer unparalleled underwater wonders.

Housed in the university planetarium, the thousand-strong collection of tiny towelettes includes a used one from the hosts of Car Talk.

Horrifically creative torture devices and shame punishments line the walls of this chilling museum.

Largest magic museum in the United States with more than half a million pieces of memorabilia.