This natural wonder drops 16 stories straight down through rare flora and streaming waterfalls.

Famous for its bio-luminescent inhabitants, known as "dismalites."

One person's lost luggage is another person's treasure.

Andy Griffith's hometown has made itself up to look like the fictional town of Mayberry.

Right next to departures—how convenient!

The Pentagon sits on a former island that was in Virginia at low tide and D.C. at high tide.

Rumor has it the hot dog stand was targeted by two Russian nuclear missiles.

The iconic statue was moved to a new spot overlooking the James river after several years as a mascot for the local baseball team.

America's second-oldest brick baseball stadium was home to a legendary WWII series that only sailors got to see.

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

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

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

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

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

An enormous warehouse filled with parade floats collected from over 50 years of patriotic celebrations.

The Kirkland Monument remembers a selfless Civil War hero who braved the battlefield to give water to his dying enemies.

The maritime museum that boasts the largest nautical library in the western hemisphere.

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

A museum dedicated exclusively to aircraft used in the military.

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 simple stone memorial remembers a secret, Geneva Convention-defying interrogation base from WWII.

A double agent hid information for the Soviet Union beneath this bridge for more than 20 years.

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

This old-fashioned carhop restaurant gave the world the waffle cone.