621
xkcd #2922: Pub Trivia
(imgs.xkcd.com)
Alt text:
Bonus question: Where is London located? (a) The British Isles (b) Great Britain and Northern Ireland (c) The UK (d) Europe (or 'the EU') (e) Greater London
It was also the capital before Canberra, so I guess it gets to be the other one after Canberra?
Only Melbourne was previously the official capital of the federated colonies which became the Commonwealth of Australia. Sydney was, and still is, the capital of NSW - but was never the capital of the country.