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

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

Outsider art meets paleontology at this roadside reptile repository.

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

A museum in the heart of Virginia peanut country devoted to the humble goober.

Giant busts of 42 U.S. presidents are sitting in a field in Virginia.

The tomb was guarded by soldiers from both sides of the war, and some left their initials carved in the brick.

The Virginia farm where John Wilkes Booth met his grisly end is now largely forgotten.

This pre-Revolutionary War grist mill ground corn and flour for soldiers in seven American wars.

This sprawling farm was once a Cold War-era hideaway for the nation's top diplomats.

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

This unique museum cafeteria showcases the history and regional diversity of African American cuisine.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

A building shaped like the Army Corps of Engineers logo, because why not?

When it comes to handsignals (and colonialism) rock always beats scissors.

100 years later, they're still down there.

A diminutive plaque recalls the treetop sniper who almost killed Abe Lincoln.

This forgotten boat elevator was an engineering marvel in its heyday.

A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

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

A much-maligned monument to teetotalism.

The span is crooked and made from two older recycled bridges.

A historic ruin just 20 feet away from a busy highway onramp.