Huoluochaideng
China
The Horočhaidam (Mongolian: ᠬᠣᠷᠣᠭᠠ ᠴᠠᡳᡩᠠᠮ) or Huoluochaideng city site in Hanggin Banner, Inner Mongolia, is known for the massive quantity of coins (3500 kg) that were found there. The coins included Wu Zhu cash coins from the Han dynasty as well as coinage produced under Wang Mang's Xin dynasty.
Archaeological site data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).