Often overlooked by travellers, Canberra is well worth a stop, especially if you are travelling from Sydney to Melbourne. Easy to get around, with a wealth of attractions (Parliament House, Old Parliament House, National Gallery, the Australian War Memorial just for starters) Canberra is an excellent location for travellers looking for an insight into the nation. Especially good for families.
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It's easiest to travel around Canberra if you have a car or bike, but it is a great place to visit for a couple of days. It provides a better overview of what Australia is, as a nation, than Sydney or Melbourne alone.