A hotel and restaurant serving as the mecca of kitsch.

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

Once a year, at exactly 11:11 a.m., this monument comes to life.

A geological mystery on Camelback Mountain.

A ship that lived many lives under many names is now known merely as the "Ghost Ship."

A turn-of-the-century architectural marvel built on healing mineral springs and salt licks.

A museum to a cave explorer whose tragic death was a media sensation, and whose corpse became a tourist attraction.

Tiki luxury on Nob Hill.

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

A winding path built in secret on the edge of the continent.

An artsy hidden staircase leads to breathtaking views of San Francisco.

This reclusive Hopi village in Arizona has been continuously populated longer than anywhere else in America.

The best Tiki bar in Las Vegas.

A new kind of theme park for adults off the Las Vegas Strip.

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

Experience a charming 1930's version of "infotainment."

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

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

A psychedelic labyrinth on the San Francisco bay.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.

Hide from the tourist hordes in these relatively unknown, and unguarded lava caves.