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.

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

The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.

Hear, smell, see, taste, and touch history at this immersive Civil War hospital.

Located at the former Lorton Prison the Lucy Burns Museum tells the story of the 91 year history of the prison including the dark chapter of its involvement in the women's suffrage movement.

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

This Virginia railway overpass is said to be haunted by a serial killer in a rabbit costume.

D.C. once had its own tiny rival to the New York Stock Exchange.

An 18-mile-long tunnel for sewage waste will soon wind within the bowels of Washington, D.C.

Look closely and you’ll notice that the color changes a third of the way up the tower.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

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

The only National Monument ever to go missing for nearly 50 years then resurface in a dump.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

This lovely pocket park is one of the most under appreciated in D.C.

You could be standing at the site of one of D.C.'s most fatal tragedies and not even know it.

The famous abolitionist’s preserved estate is one of Washington's finest monuments to its great Black citizens.

When it opened during the final years of the embargo, all the drinks and cigars were free.

People escaping slavery may have hidden inside a corpse vault.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

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

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.