* Astronomy

The Baigong Pipes are a series of pipe-like features found on and near Mount Baigong about 40 km southeast of the city of Delingha, in the Haixi Mongol and Tibetan region.
These pipe-like features are cited by various web pages as an example of an out of place artefact, and have been put forward as a possible sign of extraterrestrial life having visited Earth.

Source

Investigations by experts resulted in the following hypotheses:

--Relics of prehistoric human beings. It is believed that prehistoric men held higher industrial and cultural achievements than existing human beings. Relics of their achievements remained after they disappeared with changing glacier conditions. However, no sign of glacier activity was evident around Mount Baigong.

--Fossils of plants with tube-shaped stems formed under high pressure. Scientific analysis tells us that fossils of fauna and flora can only remain the same; fossils could not change into forms such as iron pipes positioned in different ways. In addition, there has neither been any report of iron in the surrounding area, nor is there any evidence of fossils.

--A unique geological phenomenon. After an investigative tour of the area, Zheng Jiandong, a geology research fellow from the China Earthquake Administration said he favors the possibility that when underground magma rose to the surface ferric materials froze to form the tube-like objects.

"There is indeed something mysterious about these pipes, for example, the size of the pipes tends to be small and some of them are highly radioactive" -  Zheng Jiandong.

Source: People's Daily Online

Mount Baigong
Latitude:  23° 26' 7" N, Longitude: 114° 33' 17" E

Twin lake
Latitude:  96.94882838750756, Longitude: 37.13444061164466