These structures were inspired by both Native American shelters as well as, strangely, an ice cream shop.

A museum dedicated to restoring vintage aircraft, located at a working airport.

The remnants of a failed socialist commune can still be found just off a California highway.

Hundreds of trees made from glass bottles make up this forest on Route 66.

Abandoned Air Force base that has fallen into disrepair.

The world's smallest drawbridge.

Once a strategically imperative naval base, portions of this Bermuda dock complex now serve cruise ships.

This abandoned artificial island off the coast of New York City is now home to dozens of harbor seals.

Once America's longest-manned military fort, now an abandoned hulk.

A cargo of beautiful music.

Visit the monolithic tomb of America's most famous general.

Hordes of precariously balanced stone figures crowd the shores of the Hudson River.

Little Red Lighthouse under the George Washington Bridge.

This hidden oasis features a stunning view of the Hudson River and the Palisades from a castle-like museum.

Built in the 1920s, this co-op in the Bronx feels more like an Italian villa than a typical New York apartment building.

In 1986, Keith Haring was arrested for painting this anti-drug mural on a Harlem handball court.

A little lighthouse in New York City, surrounded by mysterious stories of insanity-driven construction.

A former insane asylum despised by Nelly Bly and Charles Dickens is now fashionable apartments.

A sculptural commentary on capitalism pokes up from the East River.

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

A crumbling hospital from the 1850s on Roosevelt Island.

Once a flowing stream and where the USS Monitor, the world's first ironclad, was built and launched.

On the Hudson resides one of the largest clocks in the world.

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