The Baigong pipes represent one of the greatest enigmas of the ancient world. They are located within a badly-eroded pyramid standing on top of Mount Baigong in the Qinghai Province of northwestern China.

The collapsing monument once had triangular entrances on all three facets but, as years gone by, two of them caved in and are currently unreachable. The one that still stands stretches deep inside the mountain. Iron scraps and curious stones ornate the floor, indicating that long time ago, this place saw activity.

The last remaining cave shelters an intricate network of metal pipes, with diameters ranging from 1.5 feet to as small as a toothpick. Dozens of pipes lead straight into the mountain, final destination unknown.
SOURCE: https://alienpolicy.com

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