From the World Heritage inscription:
This area, which stretches along the north-east coast of Australia for some 450 km, is made up largely of tropical rainforests. This biotope offers a particularly extensive and varied array of plants, as well as marsupials and singing birds, along with other rare and endangered animals and plant species.
Like the Gondwana Raniforests of Australia, the Wet Tropics of Queensland encompasses a large stretch of land along the coast of Northern Queensland. There are many places you can visit, the most popular ones being outside of Cairns. Cairns prids itself as being one of the only cities in the world which sits between two World Heritage sites: the Wet Tropics and the Great Barrier Reef.
I visited Girringun National Park which is one of the southernmost parks in the World Heritage Site. It is also the home of Wallaman Falls, the highest waterfall in Australia.