The Coral Castle near Miami was built by Ed Leedskalnin who took his secrets to the grave, and how he built the engineering marvel is still a mystery.

Peter Gibbs took his Cessna out at night one Christmas Eve in Scotland. What happened to him would come to be known as the Great Mull Air Mystery.

Clairvius Narcisse was declared dead in 1962 and buried the next day. He returned to his village in 1980 claiming to have been zombified.

In the tiny town of Tofield, Canada, in 1977, Septic Tank Sam was discovered on an abandoned farm. His identity and that of the killer still haunt us today.

Valhalla is an important concept of Norse mythology and the religion of the Vikings. What do the Old Norse sources tell us about this place?

Many cultures around the world have been creating elongated skulls for thousands of years, but the exact reasons why are still a mystery.

The case of Blair Adams is a strange unsolved mystery. He said someone was trying to kill him and wound up dead thousands of miles away.

Carl Tanzler was a doctor who was obsessively in love with one of his patients. Shockingly, his love took an unnatural turn after she died.