 We've all heard about the Great Pyramid, the one in Giza, that's the tallest pyramid on Earth, right? You may be surprised to discover that the Great Pyramid found in Giza is not the tallest one on Earth. In fact, it's not even close. Wait till you hear this. In China, there are large pyramids that are not only lined with the stars and showing advanced mathematics and layout design and construction, they are also among the largest in the world. In fact, the true Great Pyramid, the largest that we know of, is twice the size of the Great Pyramid at Giza and is hidden in plain sight. But why are the Chinese trying to hide the biggest and most significant archaeological find of the ancient world? Despite speculation about the existence of the Great Pyramids in China, archaeologists have refused to consider even rumors about such structures, but recent aerial pictures prove that China's pyramids are indeed real, rivaling those of Egypt and Central America for their age, size, and significance. The Chinese pyramids drew popular attention just after World War II. Many early stories were focused on the existence of the Great White Pyramid. This is the tomb of Emperor Wu of Han, located in the Shangxi province. US Army Air Corps pilot James Gosman is said to have seen a white jewel-top pyramid during a flight between India and China during World War II. James Gosman told of his eyewitness encounter with the Chinese pyramid in the March 28, 1947 edition of The New York Times. A photo of a pyramid in China appeared in the New York Sunday News March 30, 1947, raising a few eyebrows across the globe. Pseudo-Historians have increased Western awareness of these pyramids. Artway Cosdorff speculated that it was built by aliens, and Philip Copens repeated this theory. The existence of these pyramids in China remained completely unknown in the Western world until the 1910s. They were documented in large numbers around Xi'an, first in 1912 by the Western traders Fred Meyerschroder and Oscar Maaman, also in 1913 by the expedition of Victor Segolin. It's located about 40 miles southwest of Xi'an, the largest of 16 pyramids located in this area designated as a no-go area, a forbidden zone by communist authorities. These restrictions make it extremely difficult and dangerous for Westerners to visit the pyramid and take photographs of it. Despite the restrictions, and with the help of the people of China, photos are emerging. It's unknown when exactly the Great Pyramid of China was built, according to some Chinese archaeologists the pyramid was built about 3,000 years before the birth of Christ. Ancient records preserved in an old monastery near the Mongolian border describe the Xi'an pyramid. The structure was said to measure 1,000 feet in height, which made it the highest pyramid in the world. The Great Pyramid of Egypt is 450 feet in height, so the Great China Pyramid is more than double the height. Imagine that for a second, two Giza pyramids on top of each other, and then some. Doesn't that blow your mind? According to the monastic documents, the pyramid was already extremely old when the records were made, so we're talking about some of the oldest structures on earth here. In the valleys around the Xi'an pyramid, there are dozens of other pyramids, almost as tall as the Great Xi'an Pyramid. These smaller ones are also larger than any of the other pyramids found scattered across the globe. When Hartwig Hausdorff and his friend Guider Krasler reached the township of Sengyang about 40 miles west of Xi'an, they saw at least 15 pyramids in the area. The two researchers were surprised to see small trees planted at the sides of these pyramids. I've been told that over the past four or five years, the Chinese have been planting fast-growing conifers, a kind of cypress tree on the slopes of these pyramids. I wondered briefly what they were trying to hide by making these ancient wonders blend so completely into the surroundings. The construction of these smaller Chinese pyramids is similar to that of the pyramids of New Mexico City. The tops of most of these Chinese structures are flattened off, similar to the rectangle of the structure of the Mayan's Hausdorff set. The estimated age of these pyramids is 6,000 years, and it's believed that they've been arranged to align with certain constellations in the night sky. Just as certain key pyramids in Egypt were constructed, an imitation of the constellation Orion. The Chinese pyramids near Xi'an are proof of the immense knowledge of geometry and mathematics by the builders five millennia ago. Who were they, and where did they go? In 1994, archaeologists discovered several pyramids near the Wei River north of Xi'an. It is thought that there may be as many as 100 pyramids in China, including the Great White Pyramid, which is the highest of them all. They're all unheard of in the western world, so spread the word, guys. Who were the mysterious Chinese pyramid builders? Were they members of an ancient Atlantean civilization, or were they perhaps giants of the past, or maybe even alien visitors or inhabitants from the stars? Maybe they positioned the pyramids under their home stars. Several villagers claimed a distant ancestor spoke of sky ships that navigated the heavens and used the pyramids. Whatever the purpose was for these pyramids, they were built with such precision that our current technology cannot replicate it. Pretty amazing, right? What do you guys think of the giant pyramids in China? Why are the Chinese trying to keep them secret? Comments below. Thanks for watching, and remember, the ways at which we arrive at knowledge are hardly less wonderful than the discovery of these things themselves.