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the pyramid could be The Mausoleum of the First Qin Emperor.
from wiki:
"The Mausoleum of the First Qin Emperor (Qin Shi Huang) (Chinese: 秦始皇陵; pinyin: Qínshǐhuáng Líng) is located in Lintong District, Xi'an, Shaanxi province of China. This mausoleum was constructed over 38 years, from 246 to 208 BC, and is situated underneath a 76-meter-tall tomb mound shaped like a truncated pyramid. The layout of the mausoleum is modeled on the Qin capital Xianyang, divided into inner and outer cities. The circumference of the inner city is 2.5 km (1.55 miles) and the outer is 6.3 km (3.9 miles). The tomb is located in the southwest of the inner city and faces east. The main tomb chamber housing the coffin and burial artifacts is the core of the architectural complex of the mausoleum.
The tomb itself has not yet been excavated. Archaeological explorations currently concentrate on various sites of the extensive necropolis surrounding the tomb, including the Terracotta Army to the east of the tomb mound.The Terracotta Army served as a garrison to the mausoleum and has yet to be completely excavated."
It could be a perfect dungeon for a legendary pokemon
