This small hilltop church weaves the urban history of Washington, D.C. with the national history of the United States.

On the Fourth of July this area will transform into a Pompeii-like storm of falling embers and ash.

The former home of the woman who successfully fought to integrate restaurants in Washington, D.C.

One of the last mosaic tile facades found in the city.

The only tennis court that falls under the jurisdiction of the central bank.

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

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

An 18-mile-long tunnel for sewage waste will soon wind within the bowels of Washington, D.C.

Once a sewer culvert, this road tunnel now offers cyclists and pedestrians a subterranean stroll under the C&O Canal.

The word "Watergate" will forever be associated with the infamous scandal in 1972, but this fountain is famous in its own right.

The National Park Service’s best-kept secret with views that rival any in D.C.

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

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

These abandoned waterworks are crumbling into the Potomac River.

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

100 years later, they're still down there.

There's an old indoor swimming pool hidden directly underneath the White House Press Briefing Room.

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

Before Nixon, "watergate" meant canals.

This unassuming passageway played a key role in one of the most important events in U.S. history.

A building shaped like the Army Corps of Engineers logo, because why not?

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

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

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