The Gloucester Tree is a fire-lookout tree

The Gloucester Tree is a giant karri tree in the Gloucester National Park of Western Australia.
At 58 meters in height, it is the world's second tallest fire-lookout tree (second only to the nearby Dave Evans Bicentennial Tree), and visitors can climb up to a platform in its upper branches for views of the surrounding karri forest. It is owned by the Shire of Manjimup.
Of course there is more information at the link.