America's oldest archaeological site or a muddled case of wishful thinking.

An eccentric folk art landmark made out of discarded bottles by an inspired "grandma."

This haunted hotel built on natural springs once served as a hospital for a quack doctor promising a cure for cancer.

A series of waterfalls and pools that flow through the 'Ohe'o Gulch and into the ocean.

A tunnel of hardened lava along Maui’s famous Road to Hana.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

A mysterious castle built as a monument to lost love.

Curious cave that stays a cool 56 degrees all year long.

A landscape of massive spherical boulders are the main attraction in this Kansas State Park.

Marking the spot where a conquistador gave up his search for the fabled Seven Cities of Gold.

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

A mysterious light of unknown origin on the backroads of Missouri.

The history of the treatment of mental illness, illustrated in all its gory detail, and housed in an asylum.

This Italianate Villa-style castle is pretty to look at, just keep off the private property.

A piece of John the Baptist in the American heartland.

The world's largest bioluminescent area was undiscovered by science until 2005.