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

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

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

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

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

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

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.

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

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

This unique historical monument features large concrete spheres designed to resemble fallen stars.

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

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

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

A former mental hospital founded in the 1930s by a eugenicist who advocated for the forced sterilization of patients.

This historic mansion was built as a symbol of love between a husband and wife.

The only recreation of William Shakespeare's indoor playhouse.

America's first federal monument.

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

This colonial tavern played host to George Washington, Thomas Jefferson, and other famous early Americans.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

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

An original apothecary from 1792.