Metro in Washington DC opened on March 27th, 1976. All rides were free that day on the 4.6 miles of tracks.

Mary Surratt's boarding house is a Chinese restaurant, still standing just around the corner from Gallery Place Metro. Today, it's Wok and Roll.

Discover the amazing story of Clara Barton's former office and boarding house on 7th St. NW, which was lost for over a century until a last minute discovery. Watch the entire story here.