Every winter for the past three decades, Icehotel in Sweden has reinvented itself as a hotel and art exhibition made of ice and snow.

In 1917, Dutch exotic dancer Mata Hari was executed by the French for working with the Germans. But her apparent role as a double agent remains unclear to this day.

Ever since they were deserted, these abandoned airports have all sat empty. Eerily, some of them were never used at all.

Though he refused to fire a gun, Desmond Doss became one of the most legendary soldiers of World War II — and saved 75 men during the Battle of Okinawa.

Known as the world's happiest animal, the smiling quokka of Western Australia's Rottnest Island is like an excitable kangaroo that's the size of a cat.

An acclaimed pianist with a heart of gold, Fred Rogers' wife Joanne Rogers was the perfect complement to her beloved husband.

The Philadelphia State Hospital at Byberry tormented its patients with almost no consequences from its opening in 1911 until it was finally shut down in 1990.

At the turn of the 20th century, many people who were born with unusual conditions joined "freak shows" in order to make a living. Horrifically, some were forced into it.

Empty malls across America are being abandoned at a staggering rate. But instead of demolishing these dead malls, most cities are allowing them to rot and be reclaimed by nature.

From Desmond Doss to Audie Murphy, history's greatest war heroes gave everything for their country and embodied the meaning of bravery with their incredible acts of selflessness.