Building the Parthenon was costly and labor-intensive. Huge slabs of marble had to be moved from Mount Pentelicus, a journey of ten miles.

There is nothing wrong with being a fan. But sometimes obsession goes too far. See our list of the creepiest celebrity stalkers.

The Imperial Army of Japan is purported to have hidden tons of gold in the Philippines. Where is the Yamashita gold or does it even exist?

Hidden for over a century, Scotland Yard took seriously the possibility that American Dr. Francis Tumblety was the notorious Jack the Ripper.

The Boötes void is a somewhat empty region of space that spans 330 million light-years in diameter. Where are the galaxies?

Forget Venus Flytraps. Watch out for those man-eating trees. Here are some known and cryptid carnivorous plants and trees around the world.

In 2009 the bizarre Norwegian spiral event spawned a frenzied 24-hour mystery in which even the wildest of theories now seemed plausible.

Who, or what, was responsible for the mysterious death of Polish miner Zigmund Adamski in 1980? Theories include a heart attack and even UFO connections.