The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

One of the last Jazz Age "Wonder Theaters" in New York City.

Little Red Lighthouse under the George Washington Bridge.

A humble homemade ride attracts visitors from around the globe to this small Midwestern town.

Only intact Ichthyosaur skeleton in the United States.

A former mining hospital is now a vibrant artistic hub.

Beneath a Virginia City bar is the entrance to an abandoned gold mine.

Singing sand that stands as the final remains of an ancient lake.

A tree bears footwear on the loneliest road in America.

This railroad magnate's 19th century tower is more than a little bit out of place in the Nevada desert.

This central Nevada cave is the spiritual home of ancient and enigmatic pictographs.

A Nevada mining boomtown that ran out of silver and luck.

This crumbling stump is all that remains of what was once thought to be the oldest living organism.

A gothic palace of endless stalagmites and pseudoscorpions waits within one of the world's most beautiful caves.

A whimsical, punny collection of "fence art" outside the tiny mountain town of Baker, Nevada.

Exact replica of the ancient monument, but much, much lighter.

Outsider art meets paleontology at this roadside reptile repository.

Mussolini gave Cincinnati a bronze statue of Romulus and Remus suckling at a wolf's teats.

Hidden on two floors of downtown building, the library has an incredible deal on rent.

Where beautiful signs live on forever.

This tower-tomb honors a president who only held office for a little over a month but dedicated his life to his country.

The mysterious white squirrels of this Illinois city are treated like sacred cows.

Quirky water tower advertises the long-gone Brooks Tomato Products Co.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.