An oft-overlooked, magically musical monolith that stands majestically between Arlington Cemetery and the Iwo Jima Memorial.

This eye-catching sculpture of rural life seems a bit out of place at a suburban intersection in front of a car dealership.

This church built atop a gas station promises to "equip you for the next stage in your life’s journey."

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

Long buried under the 20th-century landscape, this lift lock of the Alexandria Canal is the lone remnant of an ambitious early American transportation project.

The last remaining location of a drive-up hot dog stand named after a local pool shark.

A massive, majestic mammal watches over pedestrians from his perch atop a former B.P.O.E. lodge.

Please don’t anchor your boat onto the Department of Defense’s underwater data cables.

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

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

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

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

A former major munitions plant that has been converted into a sprawling art space.

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

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

This grave marks the passing of a historic Jane Doe whose identity remains a mystery to this day.

The only place for a truly presidential dram.

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

An original apothecary from 1792.

The narrowest house in America is seven feet of pure spite.

Giant busts of 42 U.S. presidents sit, crumbling in a field in Virginia.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

This small museum celebrates the history of the Ouija board and its connection to the city of Baltimore.

The 72-foot giant escaped confinement in a large patch of mulch only to be reburied in the sandy shores of the Potomac River.