A small granite block at this monument's base is the only part of Lincoln's Tomb outside of Illinois.

The oldest automobile museum in the United States.

A museum and research center dedicated to preserving the history of Rolls-Royce and Bentley motorcars.

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

What looks like a simple quaint estate in rural Pennsylvania was in the 18th century home to a small monastic community.

One of the few remaining covered bridges in Lancaster County.

This massive sycamore tree has been labeled as one of the largest in the state.

The busy transport hub is home to the tallest airport slide in the world.

This Art Deco airport was once deemed “the air hub of the Americas.”

These artifacts were discovered during the construction of the airport, with some dating back to the Neolithic period.

It appears as if a man is standing behind this giant airport clock, painting the hands in real time.

The tiny airport in remote Newfoundland that inspired a hit musical is also a modernist architectural gem.

Inside the Wayne County airport is an amazing collection of lights and sounds.

In Houston's airport, a cow is properly equipped to jump over the moon.

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

The last masonry skyscraper ever built reveals a transitional moment in architectural history.

An industrial waste tourist attraction.

These unique rock formations were created during the Ice Age.

Hidden deep within New Jersey Pine Barrens is a massive graffiti wonderland.

Measuring approximately 200 feet long, Swampy is the world's largest alligator-shaped building.

Believed to be haunted, this old cemetery is beautifully adorned with Spanish moss hanging from the trees.

This small beachside park commemorates the possibilities of discovery.

The site of one of history's most indelible and horrific tragedies.