The Royal Mint operated here from 1872 to 1967, producing gold sovereigns during the Victorian gold rush boom and later Australia's decimal coins after currency changeover in 1966. The heritage-listed bluestone building is one of Melbourne's finest examples of Victorian institutional architecture.
Today it houses exhibitions on the gold rush era, the mechanics of coin production, and the history of currency in Australia. The exhibitions are well put together and more engaging than you might expect — the gold rush period in Victoria was genuinely dramatic, and the mint was at the centre of it. The building itself is worth a look even if history isn't your primary interest. Located in the CBD, it's an easy add-on to a walk between the State Library and the Flagstaff Gardens.