The largest island in the world and at the same time the smallest continent is divided into 6 states and two territories that couldn't be more different.
Lieutenant James Cook was the first European to set foot on Australian soil in April 1770 and it was not until January 1788 that the British founded the first settlement. It took another 71 years for the states of Tasmania, Western Australia, South Australia, Victoria and Queensland to unite. It was not until January 1, 1901 that all colonies finally merged to form the "Commonwealth of Australia".
Today's Northern Territory, as we know it, was not spun off from South Australia until 1911 and was directly subject to the federal government until 1978. From then on, self-government was left to the Northern Territory, but any law can still be overturned by the federal parliament.
An insanely long period of time in which today's Australia developed ...
... You "only" need about 24 hours to fly from Europe to visit one or more of these extraordinary states and territories.