Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

The ruins of an ancient stadium that hosted gripping chariot and horse races.

An architect transformed this abandoned cement factory into his castle-like workshop.

A science fiction-inspired apartment building designed by a famous Spanish architect.

Mountain where Jesus was first tempted by the Devil.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

A former utopian healing center created by a huckster and built by derelicts.

This giant temperature attraction created some giant electric bills.

This crumbling Death Valley mining complex was known for its use of giant, 20-mule team wagons.

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.

A series of vibrant murals celebrate the culture and community of Oakland.

The giant pair of sexy legs sticking out the window of this costume store have become its main draw.

The tea room that pushed the boundaries of adorable straight into...we can't find the words.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

This anonymous businessman sculpted in bronze became an enduring memorial after 9/11, and had been mistaken by rescue workers for a survivor in the rubble.

There must be a pun in this haystack somewhere...

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

Elevated freight railway turned wildly successful urban park.

Try not to get slimed in Tribeca.

An homage to Jackie Gleason's bus-driving character from 'The Honeymooners.'

This 1920s railway depot is now home to two unique museums complete with a miniature train ride.

Pay homage to a mysterious feline artifact outside of this Florida museum.

Wading through a small lagoon reveals a secret, wild stretch of pristine beach.