In May and August 1989, two toddlers vanished from the same New York City park. A search turned up nothing — but their families haven't given up hope.

On an icy night, police find JoAnn Romain's abandoned car and assume she drowned in a nearby lake by suicide. But her family suspects foul play.

A massive earthquake and tsunami devastated Japan in March 2011. Residents share stories of the spirits they encountered in the wake of the disaster.

Given a furlough to go Christmas shopping in 1973, a convicted killer escapes. Police have come close to apprehending him but believe he's still at large.

After checking in at a luxury hotel with no ID or credit card, a woman dies from a gunshot. Years later, her identity — and her death — remain a mystery.

Police find the body of former White House aide Jack Wheeler in a landfill. Security footage captures strange events in the days leading up to his death.