One of the few surviving "Wigwam"-themed motels.

This former tuberculosis research hospital endeavored to cure the dreaded disease with fresh air and positive attitudes.

The world's longest known cave system.

The failure of one component toppled this entire bridge during rush hour.

A circle of giant painted vases in the former pottery capital of the United States.

A favorite of Amelia Earhart, ranking among those rare bridges that can be crossed without changing sides of the river.

An office built to look like a giant basket.

The only remnant of a small mining town is an abandoned railroad tunnel that is steeped in ghostly lore.

Prison made famous by The Shawshank Redemption has been out of commission since 1990.

The 28-foot granite map plots the locations of 40 theaters in New York City.

A uniquely lettered street sign marks the corner where the iconic word game was invented.

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

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

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

The mummified relics of an American missionary.

The most confusing clock in New York.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

A popular European tradition makes its way to the states on one of America's most famous bridges.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

The "Seinfeld" diner.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

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