The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

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

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

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

A much-maligned monument to teetotalism.

The privately owned cemetery that holds room for Washington's finest when they step down from life.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

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

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

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

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

There just so happens to be a court even higher than the U.S Supreme Court: a basketball court in the building itself.

The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

Home to items never before seen by the public.

The United States Capitol's former columns still stand.