Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

The programmatic glory of LA's giant whiskey barrel building has become an upscale reminder of the city's kitschy roadside past.

Who needs fancy modern water slides when this giant North Carolina rock works just as well?

One of the largest-ever mental hospitals now sits abandoned, surrounded by 25,000 unmarked graves.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

An unassuming secret door once led to a legendary watering hole.

A Swedenborgian glass church surrounded by redwoods sits perched atop a massive landslide area.

The tea room that pushed the boundaries of adorable straight into...we can't find the words.

These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.

An inconspicuous footbridge beloved by San Diego locals.

Explore 10 acres of environmental sculptures.

Brightly colored 30-foot-tall totems light up the desert sky just outside Las Vegas.

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.

This small-town Connecticut restaurant gives each diner a free book from its vast library.

This lake in the Cascades lives up to its name, disappearing down a hole every spring.

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

European castle ruins in an American state park are actually the product of death and grief.

The longest navigable underground river in the United States is home to countless blind and albino animals.

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

Canyon walls shrouded in ferns.

This charmingly homemade amusement park has been growing for 40 years.

Couple's personal collection of pinball machines turned public pinball museum.

An abandoned castle owned and ignored by Masons carries a cursed history.