galston gorge is a scenic valley containing dense bushland with numerous natural features such as waterfalls and streams accessible by established walking tracks. at the foot of the valley, the tunks creek bridge crosses tunks creek. the bridge was constructed in 1893 as a mcdonald timber truss one-way road bridge, and became heritage listed in 2000 under the 1977 heritage act. the second bridge, the steel military bridge, is a warren truss bridge that crosses berowra creek. it was installed in 1965 to provide fire-fighting vehicles with access between hornsby and dural. there is also a small car park located near the base of the gorge which contains three designated car spots and the galston gorge track head that allows access to sections of the great north walk.