The mysteries of humanity.

The story of the "mysterious pipes of Mount Baigong" is one of the unsolved mysteries of the last decade. An incredible find made by a group of enthusiasts in China is roaming the news pages, but has not yet been subjected to serious scientific study. "Ancient water supply system", "lake drainage device" and even "launch pad for alien spaceships" — everyone chooses what they like best. These are the mysteries of mankind, like the Baigong pipes