Inspired by the enduring popularity of the annual Australian Kangaroo Gold Bullion Coin Series, this mammoth coin has been a visitor highlight since it was cast in 2011.
The gold coin tips the scales at a massive one tonne of 99.99% pure gold.
Measuring about 80 centimetres wide and 12 centimetres deep it is the biggest, heaviest and most valuable gold bullion coin in the world.