Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

She stares out across six lanes of traffic, clutching a musket and infant with determination.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

There’s a special club house at the top for the bell ringers.

The most accurate timepiece in the world.

When it comes to handsignals (and colonialism) rock always beats scissors.

The oldest continuously operating fish market in the United States.

There’s a hidden military meme engraved on the World War II Memorial.

An overlooked memorial honoring the local Washington residents who died in World War I.

Decades before the scandal, this staircase on the river was a literal "water gate."

The national park was once a plantation estate.

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

A portal into the bricked up canal that runs through the heart of Washington D.C.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

These recently uncovered walls are all that's left of Washington, D.C's first defense contractor.

A derelict bit of transportation infrastructure hidden in the woods.

The span is crooked and made from two older recycled bridges.

Every drop of D.C. tap water flows through this old waterworks.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

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

Home to items never before seen by the public.

The site of the climactic scene from the classic horror film is now a historic landmark.