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

Parking garage where Bob Woodward met Watergate source "Deep Throat."

The final resting place of an unidentified revolutionary soldier sits behind a Virginia church.

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

An eccentric company offers eccentric millionaires the opportunity to have spaceflight-related experiences.

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.

A double agent hid information for the Soviet Union beneath this bridge for more than 20 years.

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

A 14-foot monument marks the resting place of two of the town's earliest residents—and one unknown soldier.

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