Less a museum than a bizarre fantasy world created by artists and engineers.

A bizarre roadside attraction and the first instance of miniature golf in the world.

A colorful architectural gem in Seattle's uniquely modern Central Library.

An abandoned relic of the city's failed experiment with below ground transit.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

A mysterious castle built as a monument to lost love.

Carved by a waterfall in a hard-to-reach rock formation, this heart-shaped rock has inspired romantics for decades.

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

A meditative space out of a fantasy story.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

A clear blue swimming hole with hidden caves, still unexplored.

Become a prohibition rebel.

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

One man's vast collection of artifacts and ephemera from matchbooks and postcards to vintage neon signs and cars.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

Better known as the "Body Farm," this unique research facility has been studying how human bodies break down since the 1980s.

A historic neighborhood church is reborn as a psychedelic arts collective.

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

The largest earthwork effigy in the world.

Oregon's unexpected high desert, displaying layers of time in a colorful show.

A whimsical village of unique treehouses resides in a Washington forest.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.