A star fort along the C&O Canal in western Maryland that protected America in three wars.

Berkeley Springs State Park boasts the nation's only monument commemorating presidential bathing.

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.

A former major munitions plant that has been converted into a sprawling art space.

This war hero's old shop remembers the fine line between medicine and quackery during the Revolutionary War.

The narrowest house in America is seven feet of pure spite.

The bank that helped fund the Mexican-American War and the purchase of Alaska met its downfall after helping Augusto Pinochet launder money.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

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

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.

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

Art deco landmark on the outskirts of Washington, D.C.

Washington's iconic carousel has a nice piece of Civil Rights history.

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

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

The oldest continuously operating fish market in the United States.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

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

The national park was once a plantation estate.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

The museum calls itself the "National Museum of the Paranormal" and is full of eerie oddities.

The Pentagon is so large that it was planned like a city, complete with internal highway infrastructure.