The Rumbling Bridge in Clackmannanshire, Scotland. There's a nice lore around the nearby Devil's Mill, which I really like and recommend.

“Rooted in the animism of the pre-Christian Scots, fairy belief was perhaps most truly folkoric of all popular belief systems by virtue of the fact it had never been dispensed from the pulpit or systernatized in texts, but had survived into the seventeenth century through purely oral transmission, handed down from generation to generation at the hearth and in the workplace. It is difficult to gauge the nature and intensity of early modern fairy belief because, with the exception of one slim volume written by Aberfoyle minister Robert Kirk in 1691, and scatcered references in witch records and antiquarian writings, they went largely unrecorded; remaining hidden, to quote Larner's memorable phrase, in the 'secret, uncharted areas of peasant exchange' for a further 200 years before being uncovered and celebrated by nineteenth-century folklorists. But nevertheless, contemporary research is increasingly emphasizing the fact that fairy belief was strong and widespread in the period, with Cowan and Henderson (Scottish Fairy Belief) recently stating categorically that 'What we can prove is that many Scots people, who lived mainly in the period from c. 1450 to c. 1750, had no doubt that fairies actually existed... They were a part of everyday life, as real to people as the sunrise, and as incontrovertible as the existence of God." Isobel's confessions, as we shall see, make it abundantly clear that fairy belief was chriving in seventeenth-century Auldearn.