The 2013 Bicentenary of the Crossing of the Blue Mountains commemorated 200 years since the historic expedition led by Gregory Blaxland, William Lawson, and William Charles Wentworth. In 1813, their successful crossing of the Blue Mountains in New South Wales opened up inland Australia for settlement and development. The bicentenary celebrated this landmark achievement with events and activities highlighting the significance of the expedition in Australian history and its impact on the expansion of European settlement across the continent.