Mausoleum of the Qin Shi Huang the first Emperor of China 5472?

Pit one, which is 230 metres (750 ft) long and 62 metres (203 ft) wide,[30] contains the main army of more than 6,000 figures.[31] Pit one has 11 corridors, most of which are more than 3 metres (9.8 ft) wide and paved with small bricks with a wooden ceiling supported by large beams and posts. This design was also used for the tombs of nobles and would have resembled palace hallways when built. The wooden ceilings were covered with reed mats and layers of clay for waterproofing, and then mounded with more soil raising them about 2 to 3 metres (6 ft 7 in to 9 ft 10 in) above the surrounding ground level when completed. (cc) Wikipedia