The tomb of Lars Porsenna existed as late as the 1st Century BCE and was described by Pliny the Elder. Unfortunately it has not survived to this day. The Cuniculi or labyrinths under the city are said by some to be part of this famous tomb, although it seems more likely to have been part of an elaborate drainage system.
According to Pliny the Elder, Lars Porsenna was buried "sub urbe Clusio" (under the city of Clusium), in a huge square tomb 300 feet wide, containing an inextricable labyrinth. On the tomb were pyramids and a bronze "petaso" from which were hanging chains and
bells "which played when the wind moved them...".