An extensive, if one-sided, history of U.S. law enforcement's war on drugs.

The rogue roots are gradually consuming some of the historic marble grave markers.

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

A painfully obvious spy house sits right across the street from the Russian Embassy.

The towering figures were created from the cemetery's fallen old-growth trees.

An Industrial Revolution-era public work that purified water using nothing but sand.

The Pentagon is so large that it was planned like a city, complete with internal highway infrastructure.

A celebrity from the late Cretaceous period.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

The discovery site of the "Capitalsaurus," the official dinosaur of Washington, D.C.

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

The controversial urban planner who designed Washington, D.C., was buried in Maryland, and can presently be found in Virginia.

The district's only illusionarium supports free writing programs for local students with every purchase.

A derelict bit of transportation infrastructure hidden in the woods.

The naval commander’s proudest moment in battle is memorialized in this unique tomb at Arlington Cemetery.

Born a slave on the Arlington estate, Parks dug the first graves at Arlington National Cemetery, and was buried there, too.

Home to a vast and influential collection of Shakespeareana.

A nostalgic bibliographic gem.

These recently uncovered walls are all that's left of Washington, D.C's first defense contractor.

Giftshop catering to cryptozoologists and anyone with a sense of humor.

100 years later, they're still down there.

A hoard of sky catalogs, astrophysical journals, even the works of Galileo and Copernicus.

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.

A promising candidate for the lost rock laid by George Washington was unearthed, but the hunt is still on.