The Mullet Creek Tunnel (or more accurately, culvert) was built in 1889 as part of the Sydney to Newcastle railway line construction. The historic tunnel is reached via firetrails and a bushwalking track from the Mullet Creek Trail down to the creek.
Brisbane Water National Park
The Brisbane Water National Park is a protected national park located in the Central Coast region of NSW, 47km north of Sydney. It has many bushwalks, and a large number of Aboriginal heritage sites.