There is evidence the aboriginal people used the Parramatta park area for over 20,000 years (we hope it doesn't take you quite that long to find our cache). More recently, the area was a Vice-Regal domain from 1788 as the site of Old Government House, and from 1858 the area was opened as a public park - one of the first in the world.
The cache we have placed is the first of this type we have used, so it will be interesting to see the reactions of those who find it.