The Barrenjoey Head lighthouse, constructed in 1881, is found on the Barrenjoey headland. It’s a short uphill walk from the carpark and definitely worth it for the views alone. Lighthouse tours are available on Sundays, run by friendly and knowledgeable volunteers. Highly recommended!
Fun fact: The outside of the lighthouse has never been washed. The wind keeps it clean.
More photos can be found in my gallery here.