Published on Jun 28, 2015
www.undergroundworldnews.com
Who could have built such a complex structure 150,000 years ago, at a time when man had barely started using fire?

The Baigong pipes are one of the greatest mysteries of the ancient world. They can be found inside a badly-eroded pyramid located on top of Mount Baigong in the Qinghai Province of northwestern China.

The crumbling pyramid once had triangular entrances on three of its sides but over time, two of them caved in and are currently inaccessible. The one that remains goes deep inside the mountain. Iron scraps and unusually-shaped stones litter the floor, suggesting that long ago, this place saw activity.

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