This hill in Wingen, near Scone in New South Wales is known as Burning Mountain because it actually is burning! Under the sandstone, a smouldering coal seam has been burning for over 6,000 years. Originally thought to be volcanic, it is the world's oldest known coal fire. You can follow a trail to the site and see smoke coming from the ground and the damage it has caused to the landscape. The name Wingen means "fire" in the Wonnarua language.
(Photo from Australian Traveller)
More info at Heritage Australia