Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Monasteries on rock pillars, once accessible only by frayed ropes.

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

A surreal statue honoring Prague's favorite literary son.

The hidden lair of an alchemist rediscovered in a 2002 flood.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.

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

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”

This outdoor gallery of graffiti-covered walls pays homage to the past, present, and possible future of street art.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

A famous songsmith's custom piano, dubbed "High Society," is hidden just out of sight in one of New York's finest hotels.

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

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

The "Seinfeld" diner.

Visit the monolithic tomb of America's most famous general.