An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

The oldest farmer's market in America is so ancient it was approved by the King of England.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

Home to items never before seen by the public.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

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

Forget Hollywood, one of the biggest stars in the world can be found in Roanoke, Virginia.

Conjoined twins Daisy and Violet Hilton were stars of the vaudeville circuit.

Art museum based around the collections accumulated over 58 years by one eccentric thrift store owner.

Beautiful Gothic-inspired lighthouse stands out among the run-of-the-mill striped fare on Bodies Island.

One of the best places to see wild Colonial Spanish Mustangs in the United States.

An outlandish shoe shaped house built by an eccentric millionaire.

One of the oldest living oak trees in the Southeast.

The land is home to swimming ponies and a legendary 18th-century treasure.

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

An enormous, inside-out glass globe built in 1935.

A toxic ghost town sitting atop a massive coal fire.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

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

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Elevated freight railway turned wildly successful urban park.

The celebrated eyesore created by starry-eyed sweethearts.

A former waterfront market is now in the center of town due to some interesting Boston engineering.