"The Roman plumbing and drainage system is still largely in place and shows the ingenuity of the Roman engineers. Lead pipes were used to carry hot spa water around the site using gravity flow. The Spring overflow is where surplus water from the Spring, not used in the baths, flows out to a Roman drain."

The Roman Baths is one of the best-preserved Roman sites north of the Alps and at the very heart of the site is the Sacred Spring. Hot water at a temperature of 460C rises here at the rate of 1,170,000 litres (that’s 240,000 gallons) every day and has been doing this for thousands of years. In the past this natural phenomenon was beyond human understanding and it was believed to be the work of the gods. In Roman times a great Temple was built next to the Spring dedicated to the goddess Sulis Minerva, a deity with healing powers. The mineral rich water from the Spring supplied a magnificent bath-house which attracted visitors from across the Roman Empire.