These fantastically named natural pools look like something out of a Scottish myth.

These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.

Tucked in the back of this amazing antique store is an important piece of medical history.

A snapshot of the city's fascinating voodoo culture.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

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

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

World's first "penitentiary," meant to be humane, drove men insane.

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

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

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

A terrific purveyor of natural history objects and curios.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

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

A huge musical instrument played by the ocean.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

Paranormal investigators claim this abandoned asylum is the most haunted spot in the eastern U.S.

A former mental hospital founded in the 1930s by a eugenicist who advocated for the forced sterilization of patients.

This once-palatial plantation may have been the site where a draft of the Declaration of Independence was written.

America's first public mental health facility.

This abandoned amusement park was built on a site with a dark history.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.