THE SKELETON LAKE OF ROOPKUND, INDIA

In 1942 a British forest guard in Roopkund, India made an alarming discovery. Some 16,000 feet above sea level, at the bottom of a small valley, was a frozen lake absolutely full of skeletons. That summer, the ice melting revealed even more skeletal remains, floating in the water and lying haphazardly around the lake's edges. Something horrible had happened here.

The immediate assumption (it being war time) was that these were the remains of Japanese soldiers who had died of exposure while sneaking through India. The British government, terrified of a Japanese land invasion, sent a team of investigators to determine if this was true. However upon examination they realized these bones were not from Japanese soldiers—they weren't fresh enough.

It was evident that the bones were quite old indeed. Flesh, hair, and the bones themselves had been preserved by the dry, cold air, but no one could properly determine exactly when they were from. More than that, they had no idea what had killed over 200 people in this small valley. Many theories were put forth including an epidemic, landslide, and ritual suicide. For decades, no one was able to shed light on the mystery of Skeleton Lake.

However, a 2004 expedition to the site seems to have finally revealed the mystery of what caused those people's deaths. The answer was stranger than anyone had guessed.

Read more.