This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

This geothermal hot spring hides beneath a slowly growing mineral dome.

A secret fresh water spring for animals and humans alike hidden along the most famous road in the United States.

Built as a schoolhouse in 1914, this Mission-style building has also served as a dancehall, a library, an Army canteen, and now a cultural museum.

Even in death, he's still your huckleberry.

This impressive tunnel was dug entirely by hand over the course of 36 years.

A natural swimming pool in the middle of the Carite Forest.

A little-known hot spring haven right below the highway.

Located within a historic park, the beacon is the oldest standing structure in Miami.

A community of collapsing homes more than a mile out from the Florida coast.

Where monkeys run wild and the humans are caged.

This beautiful Miami garden was designed as a laboratory for tropical plants.

St Bernard de Clairvaux Episcopal Church, better known as one of the oldest European buildings in the Western Hemisphere.

12,000 sq. ft. museum tracing erotic art from antiquity to modern times.

An abandoned water sports stadium that has become a haven for graffiti and decay.

Ride a boat through this magnificent underground world, which now doubles as a theater.

Since it formed millions of years ago, this cave system has been a sacred burial ground, a Prohibition-era speakeasy, and the center of an amusement park.

In which a local geological marvel becomes a quaint roadside attraction.

The eroded core of an ancient volcano is now accessible by a short hike.

This remote desert watering hole has a connection to a curious chapter of American history.

The first steel dam in the world and the only one still functional in the United States.

Bootleggers ran booze beneath this building before (and after) Route 66 appeared beside it.

A small canyon with petroglyphs and a seasonal waterfall, only a short hike from the remnants of old Route 66.

The short-lived railroad town in central Oregon has been abandoned since the 1930s.