The U.S. Supreme Court's secret Cold War relocation facility in the mountains of North Carolina.

This nine-story building can be played like an instrument.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

These eerie outliers of the lightning bug family glow a mysterious blue color.

Robots, lasers, and whoopee cushions, oh my!

This striking art museum holds an amazing series of curiosity cabinets.

This hidden museum examines the complex history of the country's law enforcement.

A sixth-century Byzantine cistern hidden below a modern carpet store.

If drivers cross the rumble strip on this stretch of Route 66 at just the right speed it plays "America the Beautiful."

Where experiments are conducted on all things wood.

A Bhutanese temple gifted from the isolated Himalayan kingdom is now a surprising cultural gem located at the University of Texas at El Paso.

Fantastic collection celebrating the final send-off.

A health museum containing a 27’’½-foot intestine.

A 90-year-old underground water reservoir offers a more industrial kind of tranquility.

A European-style bath house in Chicago.

Former bath house turns gastropub.

Chicago's North Park Village was once the largest municipal sanatorium in the country.

A science teacher's dream.

An antiquated German apothecary on Chicago's North Side.

Revel in the Victorian splendor of the world's oldest eating establishment inside a museum.

The Columbia Road Flower Market is now open every Sunday, rain or shine.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

Banksy gives themself artistic license with this piece of London street art.