The mystery of the Chinese pyramids

The virtually unknown Chinese pyramids are historic monuments that now struggle against the ravages of time and the elements. The elaborate walls of one grand structure were accidentally discovered by U.S. pilot James Gaussman towards the end of the Second World War.  His engine failed when returning from a mission to aid the Chinese army en route to his base in Assam, India. Flying over Xi'an at a low altitude, Gaussman was astonished at the site of an enormous pyramid in the distance. The pilot did not waste this precious opportunity, and flew over, taking the photographs that would later accompany a report presented to U.S governmental authorities. In 1947, another U.S. pilot, keen to the legend of Gaussman's mysterious 'Great White' Chinese pyramid, flew close enough to the structure to catch a glimpse for himself. He estimated the ancient wonder to stand nearly 1500 ft high in comparison to Egypt's great pyramid of Giza which stands a mere 480 ft. from base to vertex. Yet this miraculous pyramid remained a closely guarded secret, kept hidden from the prying eyes of international investigation by Chinese authorities. ... In 2000, China recognized that there were some 400 pyramids in the Shanxi region, to the north of Xi'an. Smaller than the legendary 'Great White' pyramid, these ancient remains have been classified by some as burial mounds.  While some of these structures do in fact serve as tombs, others suggest the earliest Chinese pyramids served a more mysterious purpose. - mysterytopia

Here is some info on what is supposedly the largest pyramid in the world.

"Great White Pyramid" of "Xian,China" is the "Worlds Largest Pyramid". It is reported to be about 300 meters high. It is found in Tibet - located in the Qin Ling Shan mountains, about100 km southwest of the city of Xi'an, in the People's Republic of China. Life Magazine had a picture of this Tibetan Pyramid taken in 1957. The first picture to be seen here was taken from a C-54 in world war II by a pilot who flew supplies through the Himalaya Mountain terrain as a volunteer helping the Chinese. Hartwig Hausdorf, a researcher in Germany, sent over photographs from his collection, taken during his 1994 trip to the Forbidden Zone in The Shensi Province in China. Estimates for an age are 4,500 years old. Hausdorf mentions the diaries of two Australian traders who, in 1912, met an old Buddhist monk who told them these pyramids are mentioned in the 5,000 year old records of his monastery as being "very old."- 2002china

I'd love to learn if there is any writing or rooms inside this pyramid. Perhaps this one shows that Tibet was the center of a forgotten "advanced" human civilization which led to the pyramids in Egypt and elsewhere.

One theory about unexplained UFOs is that a past Earth civilization went underground and continued to progress technologically to a point where they are now superior to us. This may explain encounters with "Nordic" human looking aliens, or the "Men in Black" who seem very odd and otherworldly and who turn up in connection with some UFO and strange creature sightings (like the Mothman.)