Murogrosso (literally: big wall) is the popular name of  an ancient masonry structure, including a bridge, that allowed the old Roman route Via Cassia to cross the River Chiani. The Murogrosso, which tradition assigns to Emperor Nero (37-68 a.C.), is thought to be part of a larger hydraulic work, built by the Romans to avoid flooding risk in the downstream areas. The bridge has been demolished in 1937, in a period of poor attention to the preservation of historic buildings. Masonry remains are still visible in the wood.