The South Bridge Vaults, also known as the Edinburgh Vaults, are a series of chambers located beneath the South Bridge in Edinburgh, Scotland. These vaults were built in the late 18th century and were initially used as storage space for taverns and workshops. However, over time, they became a haven for the city's poorest residents and a hotspot for criminal activity. The conditions in the vaults were terrible, with dampness, poor air quality, and overcrowding. Today, the vaults are mainly used for ghost tours and private events, but they have also gained a reputation for being haunted. So, if you're up for some spooky adventures, the South Bridge Vaults might be worth exploring!