This fantastical waterfall is hidden in a cave located in a cracked cliff.

This castle played host to the largest great hall found in medieval Central Europe.

It took over 100 years to decode this enigmatic epitaph for two buried brides.

Also known as "Robin Hood's tree," this tree became a famed location along Hadrian's Wall before it was cut down in an act of vandalism.

A grove of "candelabra redwoods" deep in California's Lost Coast.

One of the oldest anatomical theaters in the U.S. still in use was once the site of an infamous cadaver riot.

A winding district gerrymandered into the shape of a mantis.

This splendid Versailles-inspired mansion has the largest French-style formal gardens in North America.

Mile-long cave system near Great Smoky Mountains.

This 5-by-6-foot wooden hut is the smallest historic post office in the U.S.

North Carolina's finest examples of Native American pictographs have survived for 5,000 years.

This historic church houses the grave of a Scottish soldier who fought in the Battle of Waterloo.

The highest point in North Carolina and the United States east of the Mississippi River, Mount Mitchell is named after argumentative explorer Elisha Mitchell.

This bridge is haunted by the ghost of a distraught mother.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

The World's First 24 Hour Coin-Operated Art Gallery!! Plastic, Styrofoam, and Elvis--If you can't get rid of it, you might as well worship it!!

Portland had a unique approach to Cold War-era protections.

Their motto is, "We've been bonkers for hats even longer than you have!"

A 100-year-old purveyor of curiosities, curios, and kitsch featuring mummies, shrunken heads, and a Fiji Mermaid.

A (slightly) grownup take on the classic retro arcade.

This semi-secret garden in south Seattle emulates a traditional Japanese garden using the plants of the Pacific Northwest.

From a neon Rapunzel to a bike traffic meter to a street fair color scheme, the most opened drawbridge in the US is a veritable art gallery.

A wall of chewing gum moonlights as collective art.