Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

Enormous lake at the bottom of a unique cave system.

Twice a day, the water of the Petitcodiac River flows upstream in a surfable wave.

These powerful, if squat, Canadian waterfalls flow in different directions depending on the time of day.

A commemorative plaque hides a door that leads down to the New York Public Library's underground book bunker.

A popular European tradition makes its way to the states on one of America's most famous bridges.

During the 19th century, you could pay for violence off a prix fixe menu on this Manhattan street.

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

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

This memorial honors thousands of enslaved Africans and their descendants who died in colonial New York.

This sprawling 18th-century cemetery features unique and beautiful gravestones, including one shaped like a tree.

This abandoned neighborhood is now a park filled with beautiful trees, wildflowers, and hints of its past.

Designed as a place for patients to take in the scenery, this tower has a dark history.

Naturally formed white marble arch housed in an abandoned marble quarry from the 1800s.

A hidden "place of interment for gentlemen."

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

The East Village tenement from the cover of Led Zeppelin’s 1975 album has a tea shop on the ground floor.

A reminder to choose water over wine since 1888.

One of the few remaining American elm trees in New York’s Tompkins Square Park was the birthplace of a new religion.

Along the Palisades skyline are the ruins of a large mansion built in 1911 and demolished in the 1930s.

Said to be haunted, this tower was constructed by a sugar importer as a gift to his wife.

On a barren hillside in the Yucca Valley, the recently restored Desert Christ Park has attracted pilgrims and kitsch hunters for over 50 years.

Explore 10 acres of environmental sculptures.

The Mighty Wurlitzer organ continues to belt out the tunes at downtown El Segundo's historic home for silent and classic movies.