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

The national park was once a plantation estate.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

The United States Capitol's former columns still stand.

An overgrown garden stands as a grim marker of an unrealized dream.

These buildings are a poignant reminder of the thousands of horses and mules who passed through this area of the Shenandoah Valley on their way to war.

Recorded as the first person buried in Arlington Cemetery.

This small pedestal marks the spot of the first lot of land sold in Alexandria, Virginia in 1749.

This monument is dedicated to those lost on June 6, 1944, in the town with that day’s highest per-capita casualty rate.

This historic, one-acre island is the only legal place to camp in the city of Richmond.

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

The hide of Stonewall Jackson's equine sidekick is on display not far from where the ashes of his bones are buried.

Once forgotten and built over, this historic Black cemetery now houses a poignant memorial.

The taxidermy remains of the most popular pony in children's literature.

The FBI's urban training course may have the highest fake crime rate in the world.

Collecting 700 years of mechanical death-dealing, the NRA's sprawling gun museum is a revealing testament to the American obsession with armament.

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

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

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.