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.

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

Where the U.S. government kept its actual treasure, before Fort Knox.

Decades before the scandal, this staircase on the river was a literal "water gate."

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

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

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

Home to items never before seen by the public.

These unusual rooms on wheels are holdovers from the 1960s.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

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

Forget Hollywood, one of the biggest stars in the world can be found in Roanoke, Virginia.

One street divides a single town that stands in two U.S. states.

This pre-Revolutionary War grist mill ground corn and flour for soldiers in seven American wars.

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

The final resting place of two (or three) presidents, one vampire, and 18,000 Confederate soldiers.

Edgar Allan Poe's old dorm is now a shrine to the author's legacy.

A chain of bells connect the California Missions and honor the legend of the "King’s Highway."

Two mammoth statues inspired by equally tall tales lure tourists to this roadside attraction.

The awe-inspiring ship from the golden era of cruising has an incomparable history and a reputation as one of the world’s most haunted places.

Oldest building in California still in use.

The haunting ruins of Jack London's dream house.

Megachurch turned Catholic church comprised of 10,000 glass panes.