Tunnel View Lookout in the Glenbrook area of the Blue Mountains National Park, provides fantastic views. The unfenced rock platform is on the top of a cliff forming the southern wall of Glenbrook Gorge. The lookout is named after the train tunnel on the other side of the gorge, built in 1911. There are amazing views across some of the taller peaks in the park to the north west and down the gorge to the plains of Western Sydney. Please stay at least 5m back from the cliff edge to avoid the risk of a significant fall.