This is probably one of the coolest places to visit in Chongqing. The Huguang Guild Hall was first built in 1759 in the Qing Dynasty as a kind of union hall; it was expanded many times over the years, turning it into a sprawling complex of buildings, courtyards, and gardens.
The 300-year-old complex has been renovated and is still in active use. The walls, doors, and windows of the wooden buildings have been carefully carved with human figures, animals, and plants. The skill of the woodcarvers is amazing to see.
Some of the halls are used to show theater or Peking opera. There's also a museum that highlights the history of the hall. My favorite part is all the little stalls and shops selling crafts, knickknacks, art, old money, and more. I could easily spend half a day at the hall.