This innocent-looking townhome is actually a subway exit.

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

The only natural cave bath in all of Europe.

Two community gardens under the elevated subway lines on a very busy commercial strip in Bushwick.

War prevented this Polish composer's body from being returned to his home country for 51 years. Though his ashes eventually made it home, his heart stayed behind.

The final resting place of this rock icon has become a pilgrimage site for AC/DC fans.

The home and birthplace of Caroline Dormon, a naturalist, artist, and the "mother of the Kisatchie National Forest."

Slyly buy a shake in the Parker Meridien lobby.

This translucent sculpture represents a quintessential component of New York City's skyline.

A hidden bar inside an ad agency has a deliberately misleading name, so employees can stay late under pretext of paperwork.

The highest waterfall between the Rockies and the Appalachian Mountains.

The remains of what was once the world's steepest passenger funicular.

A brutalist war memorial piercing through the rolling farm landscape.

This tiny church near Sleepy Hollow contains Henri Matisse's last work, a rose window, and nine windows by Marc Chagall.

Haunted Victorian house that inspired a legendary "Ghostbusters" court ruling.

These World War I shooting range tunnels are now haunted halls of underground graffiti accessed through the roots of a tree.

This giant rock arrived at this quiet park thousands of years ago on the back of a massive glacier.

Astonishing collection of helmets, scientific instruments, and medical models.

Reclaimed by nature, the ruins of Doodletown, New York are remnants of a town consumed by a state park.

This forlorn park is the result of a failed investment turned tax dodge.

The largest Buddha statue in the Western Hemisphere is just 50 miles north of NYC.

The largest known open fault in the United States is basically a giant natural refrigerator.

The rustic think-space of famed naturalist John Burroughs stands exactly as he left it.

An unassuming island in the middle of the Hudson that hosts campers, including Aleister Crowley.