This structure among the trees was the result of divine inspiration.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

Home of an evil witch famous within southern folklore.

The final resting place of New Orleans' most famous voodoo priestess.

A 140-year-old castle with underground caves hidden in San Francisco.

A layered tribute to the work of mosaicist Isaiah Zagar.

Continuing the tradition of the dime museum in style.

The first declared National Monument in the United States.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

Medical and zoological curiosities for sale.

Odd outsider art installations surround a Gold Rush-era ghost town.

A collection of haunted artifacts chronicles the career of the world's most famous paranormal investigators.

Enormous lake at the bottom of a unique cave system.

Site of a former hidden treehouse in New Orleans.

A 100-year-old purveyor of curiosities, curios, and kitsch featuring mummies, shrunken heads, and a Fiji Mermaid.

A hand-built folk art installation covered with messages of God's love.

Towering basalt columns, a creation of fire and ice.

A museum devoted to bringing to light forgotten or neglected histories through exhibitions, education and public programming.

Try not to get slimed in Tribeca.

The seamy, underground secrets of Portland's criminal past.

Eighteen miniature death-scene dioramas.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

An enormous, inside-out glass globe built in 1935.