This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.

One of the oldest living oak trees in the Southeast.

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

These millipedes glow not out of attraction, but as a not-too-subtle warning.

These aggressively sustainable art homes look like something out of 1970's science fiction.

A house carved into a rock in the 1940s.

When ecosystems collide in the arid Southwest.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

A piece of outsider public art accompanied by a strange urban legend.

The highest bridge in America was built for an almost unnervingly small amount of money.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

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

A French chateau, failed utopian community, odd museum, and Stonehenge replica in rural Washington State.

A meditative space out of a fantasy story.

In the remote high desert of New Mexico, a strange array of poles beckon fury from above.

This family mausoleum is steeped in symbolism and looks more like a fantasy location than a grave.

Stay in a room with a view... of the bottom of the ocean.

A futuristic temple of light uses prisms and rainbows to create an atmosphere of peace.

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

This massive redwood tree has a hole in the base big enough to drive through.

Legends surround this jagged rock formation in the New Mexico desert.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

Treehouse motel and treehouse-building school.