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.

The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

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

This forgotten boat elevator was an engineering marvel in its heyday.

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

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

Home to items never before seen by the public.

For 60 years, the academy had no permanent location until members voted Washington D.C. as its forever home.

This statue of one of baseball’s greatest pitchers looks like something out of a sci-fi horror movie.

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

At 207 feet, one of the world's longest continuous escalators.

The national park was once a plantation estate.

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

Located at the former Lorton Prison the Lucy Burns Museum tells the story of the 91 year history of the prison including the dark chapter of its involvement in the women's suffrage movement.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

The former home of the man whose radical ideas changed the nation.

Right next to departures—how convenient!

The remains of a historic plantation nestled in between a parking lot and the rental car return at Reagan National Airport.

The romance of early commercial flight still fills this Art Deco destination.

This church is known as "The Home Church of George Washington and George Mason."

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.