Introduction to Nantianmen: Nantianmen is the largest mountaintop gate in the country, 13.9 meters high and 23 meters wide. It integrates three arches into one, which is a huge project and majestic. It is extremely rare among the mountaintop gate buildings in the country. Its walls are all decorated with white marble and painted in Hexi painting method. 38 piers support the golden dome, which are overlapping and staggered. Each pier is composed of 7 layers and 14 pieces, with rich and colorful outline changes; three-meter-high copper-cast gold lions on both sides, with round eyes and majestic look, guard the Nantianmen.