Mysterious 500-year-old tapestries depict a unicorn hunt.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

Quite simply the largest tree in the world (by volume).

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

The world's longest known cave system.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

A museum dedicated to the alleged Roswell Incident.

This incredible collection of vintage pinball machines can be played at 25 cents a pop.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

One of only two commuter aerial tramways in the United States.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

Read a book next to a Midtown waterfall.

The oldest cemetery in New Orleans, resting peacefully for over 200 years now.

Home to items never before seen by the public.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

Order scoops of pandan, lychee, and black sesame at this family-run institution.