The exhibit in Washington, D.C. is part of the celebration of America's upcoming 250th anniversary.

Pol Pot died on April 15, 1998 at the age of 73 — seemingly from heart failure, though rumors of suicide or even murder began to spread in the aftermath.

For 139 years, many tried in vain to find the F.J. King, eventually earning it a reputation as a "ghost ship." But now, a group including more than a dozen citizen scientists and community historians have succeeded where countless others could not.

Between 1986 and 2013, Christopher Thomas Knight lived alone in the woods of Maine, stealing from seasonal cabins and summer camps in order to survive.

John Phillips formed the Mamas & the Papas in 1965 and wrote many of the band's greatest hits, but when the group broke up just three years later, his substance abuse overtook his life.

The National Archives has since recovered the book, which contains more than 500 pages of daily logs from the Pearl Harbor Navy Yard between March 1941 and June 1942.

These vivid photos give a new perspective on the lives of John F. Kennedy and his siblings before their family became America's most famous political dynasty.

The first-of-its-kind whistle was found in an ancient village for laborers who worked on the royal tomb of the pharaoh Akhenaten, suggesting the site was heavily policed and restricted.

Jian Rangkharasamee was a 58-year-old zookeeper at Safari World in Bangkok and had more than 20 years of experience with lions and tigers.

After New York City's Twin Towers were destroyed on September 11, 2001, rescue, recovery, and cleanup workers began uncovering tragic artifacts at Ground Zero — including some victims' damaged ID cards.