Nondescript elevator doors open to reveal a stunning, surreal world.

This former Norwegian sailor's church is slowly being taken over by ramshackle robot musicians.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

A celebration of capitalism in Midtown.

Ride the subways of yesteryear.

A tunnel once abandoned now thrives with graffiti art as an off-limits makeshift gallery.

More gold than anywhere else, ever.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

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

What was meant to be a temporary exhibit is now a permanent fixture at the St. Louis Zoo filled with beautiful birds.

A subterranean haunt where wine and homemade biscottis are always on the menu.

Small and slightly hidden, the American Writers Museum is preserving the legacy of America's finest authors.

This alley in downtown Chicago held the bodies of over 600 people after the fateful Iroquois Theatre fire.

Over 1,000 pieces of one of the most niche art objects imaginable: the glass paperweight.

This memorial plaque remembers a strangely shallow maritime disaster known as "Chicago's Titanic."

The palatial McDonald's that inspired Wesley Willis.

A shining sculpture made of 3,115 lights, the number of visible stars in the Northern Hemisphere.

Fragments of architectural wonders from around the globe are embedded in the newspaper building's walls.

Rochester's signature culinary delicacy.

A beautiful final resting place with some surprising residents.