Bagni di Lucca (Baths of Lucca, formerly Bagno a Corsena) is a commune of Tuscany, Italy, in the Province of Lucca with a population of 6,551. In the village of Bagno Caldo there is a hospital constructed largely at the expense of Nicholas Demidoff in 1826. In the valley of the Serchio, 3 miles below Ponte a Serraglio, is the medieval Ponte della Maddalena (circa 1100), with its lofty central arch. It is also know as 'Ponte del Diavolo'.