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

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

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

Perhaps the most scandalous statue of America's first president.

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

It was once the base for a series of domestic terror attacks.

An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.

This sandwich shop has a century-old elevator behind a sheet of plexiglass.

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

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

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

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

Home to items never before seen by the public.

Elevated freight railway turned wildly successful urban park.

The world's largest piece of copyrighted artwork.

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

This impressive Boston holy house is the American mecca for Christian scientists.

Each August, one of the largest religious (and food) celebrations in the country is held in Boston.

The oldest working bell set in North America, the bells at Old North Church sat silent for their first four years in Massachusetts.

American revolutionaries and British soldiers alike are buried here in the fourth-ever cemetery in Boston.

America's original house of worship for Spiritualism, the religious movement based on communing with the dead.

Historic Hull Street was actually the first street with a proper name in the Boston area.

A former waterfront market is now in the center of town due to some interesting Boston engineering.