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The Forbidden City was built in the fourth year of Yongle by Ming Chengzu (Zhu Di) and completed in 18 years, taking 14 years to complete. At that time, Zhu Di usurped Zhu Yunjiao's Jiangshan, first in Nanjing to handle official affairs, as to why he moved the capital to Beijing, some experts explained that "the son of heaven guards the gate of the country", and some people say that Zhu Di was not accustomed to the humid climate in the south, and Zhu Di was in Beijing when he was crowned king. Regardless of which statement is correct, the three words of the Forbidden City have appeared on the stage of history during the Zhu Di period, and they have a history of more than 600 years.

The Forbidden City that we see now has been renovated many times for various reasons, but the original appearance has not changed much. The Forbidden City is a key protected area in China, so if there is a problem with the Forbidden City, the craftsmen must repair it in time. The Forbidden City's buildings and other infrastructure require regular maintenance, and in the late 1970s, restoration experts discovered an amazing secret hidden under the Forbidden City floor tiles while restoring the Forbidden City floor tiles.
The floor of the Forbidden City was not paved with ordinary stones, but with "gold bricks", of course, "gold bricks" were not really made of gold. The production of "golden bricks" in the Forbidden City is extremely complex, and it has to go through processes such as soil extraction, billet making, firing, kilning, polishing and soaking. This is true for the general floor tile manufacturing, and for the "golden bricks" needed by the royal construction of the Forbidden City, its materials and processes are excellent. And such floor tiles, to neatly cover every inch of the floor of the main palace of the Forbidden City, you can calculate how many people's painstaking efforts there are!
And there was more than one floor, and when the experts unveiled the second floor of the floor tiles, something even more surprising happened, and there was another layer below. The experts gritted their teeth and continued to move the floor tiles downwards, which seemed to grow to the bottom of the ground, and finally, the experts opened a total of fifteen floor tiles to see the dirt underground. It can be imagined that when Ming Chengzu built the palace in order to prevent someone from digging a passage road from the ground and hiding inside the palace, he specially laid layers of green bricks underground, and the accumulated height of these bricks was about one meter.
Behind the Forbidden City, there are too many secrets hidden, a huge and majestic Forbidden City, which is made of the blood and tears of countless working people, which is bright and beautiful on the surface, but behind the scenes, there are many songs and tears, unknown sorrows and joys. In order to consolidate his supreme imperial power, the king regarded the lives of ordinary people as ants, which was really a generation of achievements!
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