Tucked away in a wooded valley on the outskirts of Bristol is a magical woodland nature reserve, Snuff Mills. Helen Mark discovers what lies beneath the trees, a now peaceful place with a history of heavy industry, where milling and stone quarrying has left behind a stunning playground for walkers and climbers. Local residents John, Beryl and Margaret grew up next to the quarry and witnessed its transformation from their secret playground to a busy public park. Engineer Geoff Wallis helped to literally unearth a fascinating piece of industrial history, and Steve England shows Helen the natural secrets of the valley.

Following the stones of the quarry Helen crosses the river and finds the grounds of what was once Bristol’s asylum and – Helen hears from volunteer Anwyl Cooper-Willis - a landscape carefully designed to be therapeutic for patients and speed their recovery. But where does the name Snuff Mills come from? Is it really one of the most haunted places in Bristol? And which Hollywood star has a connection with the Asylum's story?

Presented by Helen Mark