A 340 million-year-old cave at Jenolan reopened on 20th of August after a $500,000 upgrade, reports ABC News (www.abc.net.au)

The Jenolan Caves are an example of remarkable caverns in the Blue Mountains, New South Wales, Australia; 175 kilometres west of Sydney. They are the most celebrated of several similar groups in the limestone of the country being the oldest discovered open caves in the world.

Photo by Sylvia Wu, http://www.flickr.com/photos/7347585@N05/