The hallucinogenic center of the ancient world.

This California estate was either haunted by ghosts or the Marx brothers.

Historic funicular railway, believed to be the shortest railroad in the world.

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

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

An alley way dedicated to graffiti and street art is a constantly changing street gallery.

A hamlet full of permanent Christmas spirit holds one of the earliest theme parks in the United States.

This tiny little island has, as the name says, just enough room for its single house.

A castle built for love, and abandoned due to heartbreak.

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

This supermarket is suspended 25 feet above an interstate highway.

Why have you never heard of the second most popular tourist site in New York?

This giant monument of the RCA mascot is a beloved fixture in Albany, New York.

A plaque marking the famous abolitionist's birthplace often overlooked by visitors to the nearby Charles Sumner House.

Ice cream stand, snack bar, and time capsule of milk conveyance.

An easy-to-miss garden in Boston's North End honors the mother of JFK and others who lost children in WWII.

One of the indelible moments of the American Revolution took place at this location.

The oldest Italian café in Boston, this spot also serves as a veritable museum of vintage coffee ephemera.

The bears may be gone, but their old cages can still be found.

Site of a famous 19th-century transcendentalist utopian community, now abandoned.

Ralph Waldo Emerson spent two years living here decades before it became a Frederick Law Olmsted-designed park.

These whimsical works of art tell the story of the city's past and present.

An enormous, inside-out glass globe built in 1935.

This parking garage was the site of what was - at the time - the largest cash robbery in history.