Once the most densely populated place in the world, this island is now a ghost town.

If Hello Kitty were Mickey Mouse, this would be Disneyland.

The ruins of an 800-year-old monastery boasts the tallest round tower in Ireland.

A proud bronze billy stands as an eternal symbol of Ireland's oldest festival, where a goat is made king.

A Neolithic passage tomb said to have sheltered two legendary Irish lovers.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

This serene oasis in an affluent Los Angeles neighborhood holds some of Gandhi's ashes and got Elvis into Eastern Philosophy.

A nondescript building that's been functioning as a speakeasy for nearly a century and a half.

An essential stop before plundering, BYO Cutlass.

The ghost town that ended up on Ebay.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

This strange seaside tower got its name from a wealthy eccentric who would hide coins among its stones.

A prohibition-style speakeasy takes up residence in the last Victorian residence in Hollywood.

This weird abode has inspired everything from the "House On Haunted Hil" to a robot hunter's pad.

Crypt mausoleum in cathedral's basement contains relics of third century Roman martyr, Saint Vibiana.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

A strange house built only at night, with rumored mystic inspiration.

This shop specializes in oddities and Victorian-inspired wonders.

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

It should come as no surprise that the best view of the Hollywood sign is from Batman's lair.

The legendary building that needed ghostly approval before being built.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

The only structure left with direct ties to the Salem witchcraft trials of 1692.