In China, there is a mysterious ancient aqueduct, which was built by unknown Bashny.Net

Some do not exclude the version inoplanetyan

Baygong-Shan Mountain, which is located in the Chinese province of Qinghai, more than one year dominates the minds of historians and researchers of paranormal phenomena. In one of the mountain slopes is pyramid-like structure, by all accounts having artificial origin - building consists of a metal pipe, stretching far into the interior of the rock. According to some researchers, the age of the pipes is so great that, most likely created a pyramid of people do not - at the time simply did not have the technology needed to carry out such a project.

Employees' Atlas Obscura "(an organization dedicated to the exploration and description of extraordinary cultural and natural sites, unfairly bypassed popular tourist route) believe that the pyramid could erect aliens:

«The diameter of the hollow pipe varies from a few millimeters to 40-cm, and they are located not chaotically but in a certain order. Metal tubes penetrate the rock is deep enough so as not to rush into eyes. Nomads inhabit this area is unlikely to have such advanced metallurgical skills, so the pyramid - not their handiwork, most likely, there intervened some of the more advanced civilizations ».

blockquote> However, supporters of the "extraterrestrial" theories about the origin of this building will have to take into account the results of recent scientific research of some scientists. According to their assumptions, "rusty metal pipes" - not that other, as the fossilized remains of tree roots. As a result of diagenesis (the gradual transformation of soil into rock) roots were "imbedded" into the rock and then turned into something that looks and properties resembling a rusty metal pipe.

By the way, the researchers have found evidence of this theory - the material that makes up "pipe" found organic matter, and even the remains of tree rings.

via factroom.ru