Lapstone is a small village on the eastern escarpment of the lower Blue Mountains.
Bushwalks here are popular with history enthusiasts. The popular Lapstone Zig Zag is now a walking trail along the old railway cutting. A feature of this walk is the Lucasville platform, which is now abandoned but the remains of it can still be seen.
The Knapsack Gully Viaduct is an impressive and attractive structure which can also been seen on this walk.