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

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

Look closely and you’ll notice that the color changes a third of the way up the tower.

The story behind this beloved toy—named for Theodore Roosevelt and owned by his grandson—is more complicated than you might guess.

The National Park Service’s best-kept secret with views that rival any in D.C.

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

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

A rotating cast of guys and dolls in front of a Washington, D.C. building.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

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.

This small-town Connecticut restaurant gives each diner a free book from its vast library.

This pun was simply waiting to come to life, and one defense contractor made it so.

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.

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

A throwback to 1980's gaming nostalgia.

This collection of over 50 classic pinball machines awaits visitors to downtown Roanoke.

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

This museum devoted to the gothic author holds such interesting ephemera as his socks and walking stick.

Where three rails and three centuries of transportation meet.

Heron, whitewater rapids, and urban industrialism all add to the beauty of this concrete nature walk.

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

This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.

This beautiful vintage movie palace has seen little change in form or function since the 1920s.