Call ahead before hiking up to Table Mountain's Back Table, as this small building at the northern corner of the Hely-Hutchinson Reservoir is often closed. Inside, various bits of machinery used to build the dams are displayed, including the Barclay locomotive made in Scotland in 1898 – which was dismantled and reconstructed on top of the mountain.
A straightforward way up here is from Constantia Nek, where there’s parking, and through the Cecilia Plantation; the route to Hely-Hutchinson dam is around 4km one-way.