Elevated freight railway turned wildly successful urban park.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

This giant monument of the RCA mascot is a beloved fixture in Albany, New York.

Washington's top-secret Cold War-era doomsday communications tower is located in a small neighborhood park.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

A series of abstract, silly sculptures represent the works of a great modern classical composer.

Fragments of architectural wonders from around the globe are embedded in the newspaper building's walls.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

A lush green oasis in the middle of Chicago.

Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.

Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.

This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

Largest Roman Catholic church in North America.

This grisly headstone doesn’t seem to be resting in peace.

The "lovely red Vega" of the legendary record-settling pilot.

Look closely and you’ll notice that the color changes a third of the way up the tower.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

This church built atop a gas station promises to "equip you for the next stage in your life’s journey."

The secret city built by the Manhattan Project.

You can walk through the first Boeing Air Force One, which famously carried JFK's casket from Dallas back to D.C.

This oversize piece of novelty cookware once cooked the largest pancake in the world.

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.