One of the first Second Empire-style buildings constructed in North America.

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.

A secret greenspace hides atop a Capitol parking garage.

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.

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

A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

A gorgeous mural outside a beloved D.C. restaurant pays homage to famous Black Americans.

A historic arena where the Beatles played their first concert in the U.S.

An overlooked oasis of quiet on the grounds of Washington's monumental basilica.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

D.C.'s first central library was born out of a chance encounter with the philanthropist whose name it bears.

Largest Roman Catholic church in North America.

The oldest continuously operating fish market in the United States.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.