Head 2.5km southwest out of town to the tiny riverside hamlet of Borgo a Mozzano, famed for this medieval stone bridge which climbs steeply up and over the Serchio river. The bridge was first mentioned in the 14th century and In 1670 ceppi (millstones) were prohibited from using it in a bid to preserve its ancient stone paving. Staggering up to its highest point, dropping stones into the water far below, and skipping down again is great old-fashioned fun.