It’s all downhill from here

This copper-domed valve tower sits on top of the Pen y Garreg dam, one of six dams in Mid Wales's picturesque Elan Valley which help supply water to England’s second-largest city. On the other side of the tower, water thunders over a 123ft (37m) drop, part of an elaborate system of dams, reservoirs and a 73-mile aqueduct built in the late 19th century to channel drinking water to Birmingham. Work on this huge feat of civil engineering began in 1883 and the first four dams, including Pen y Garreg, were completed by 1904. Elan Valley sits in the Cambrian Mountains so water flows downhill from the high valleys to Birmingham without needing to be pumped. It travels at less than two miles an hour, taking up to two days to reach the city’s Frankley reservoir.
© Joe Daniel Price/Moment Open/Getty Images