This abandoned dream castle and its cemetery look out over the city that once inspired their creation.

It was once the base for a series of domestic terror attacks.

This miniature feudal castle was built on a whim to honor a US Navy pioneer.

This Pringle-shaped ledge makes for the perfect photo op.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

This research center for rare prosimians is studying how they sleep to help prolong human life.

San Francisco's oldest operating hotel, with a Victorian atmosphere and a "haunted" fourth floor.

This tea house was a hand-built gift from Boulder's sister city in Tajikstan.

This landmark cemetery in Boston was created more than 300 years ago.

A retired tobacco farmer's pet project turned into a sturdy miniature city.

Yo, Adrian!

You can still ride this 100-year-old work of art in Brooklyn's largest public park.

South Carolina's last remaining slavery auction house is now a museum devoted to its own tragic history.

The miraculous hydrant that saved the Mission District in 1906.

Along a California highway is a kind of Jurassic Park made of metal.

This haunted hotel built on natural springs once served as a hospital for a quack doctor promising a cure for cancer.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

A master plumber has turned his love of art and toilets into a folk museum that's not taking the piss.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

This small section of the Sleepy Hollow Cemetery is rotten with famous authors' graves.

A world-class observatory in the California desert.

A psychological self-portrait in the form of a giant, segmented head.

This tiny New Jersey village has lived many lives but seems determined to remain a ghost town.