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

Become a prohibition rebel.

A masterpiece of LGBT art has been restored in what may now be the most valuable restroom in America.

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

More gold than anywhere else, ever.

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

Ride the subways of yesteryear.

Read a book next to a Midtown waterfall.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

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

A hands-on traveling collection of the innovative devices of yesteryear.

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

A New York garbage depot holds a secret collection of weird and wonderful refuse.

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

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

Elevated freight railway turned wildly successful urban park.

Two hula hoops appeared on the tree after a storm, and the collection kept growing.

A replica of the self-taught naturalist's iconic cabin stands inside a library near his hometown.

This small museum is dedicated to one of the most influential, yet obscure, jazz legends of Prohibition.

This 16-foot-diameter wooden coin has been standing in Iowa City since 2006.

Grant Wood painted some of his most famous works of art at this studio.

This hand-carved wooden carousel in the Story City North Park was built in 1913.

The only museum in the world dedicated to the history of sprint car racing, next to one of the country's most historic dirt tracks.

Hidden in the grounds of the Fort Dodge Museum is a "real" and terrifying petrified giant.