World's first "penitentiary," meant to be humane, drove men insane.

This scenic Maryland park was the site of one of the worst prison camps of the Civil War.

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.

Historic home of America's sweetheart sharpshooter, Annie Oakley.

Once America's tallest structure, now a Baltimore landmark.

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

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

This grave marks the passing of a historic Jane Doe whose identity remains a mystery to this day.

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