Last month a good friend and I joined a group touring the tunnels beneath the Old Treasury Building in the heart of the City of Adelaide.
The history of these is as follows (courtesy of the South Australian Government's website) :"Old Treasury Building tunnels
The Old Treasury Building on the corner of King William Street and Flinders Street was once part of a complex of buildings which served as Adelaide's chief government offices. The Building was constructed in 1839, but much modified over subsequent years, and designed by George Strickland Kingston. Only one portion of wall from the original 1839 building is still standing.
The vaults below the Treasury Building were constructed in 1850 and predate the existing building. It is thought that gold discovered by South Australian diggers in the Victorian Goldfields was stored and smelted at the Treasury Building vaults. The tunnels contain a furnace and a well, but these date from after the goldrush era.
Further information about the Old Treasury Building tunnels can be found in this conference paper: Morgan, Deb (Dept. of Environment and Heritage). Tunnel visions: Persistent myths about Adelaide's underground history, presented at the State History Conference (South Australia), 2006"
Joining other participants in http://mellowyellowmonday.blogspot.com.au/