Tarr Steps

Hugh and Joss get thrust back to the past unexpectedly at one point and find themselves smack dab in the middle of raging rapids. Believe it or not, it wasn't that easy to find raging rapids in merry old England. Apparently, most of its rivers are calm--like its inhabitants. But one place seemed to suit my needs--the River Barle in Exmoor National Park in Somerset, England, the only naturally occuring rapids in England (who knew?)

Unfortunately for Joss and Hugh, their journey in the river is further imperiled by Tarr Steps, an ancient clapper bridge (from claperius, which in Latin means "pile of stones") that sits in the middle of the River Barle, fabled to have been built by the Devil himself. It's made only of slabs of stone sitting on other slabs of stone, with only their weight to hold everthing together. No mortar was used. It's the largest clapper bridge in the world.