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

Home to items never before seen by the public.

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

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

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

You could be standing at the site of one of D.C.'s most fatal tragedies and not even know it.