A must see is the Aghinolfi castle, which has changed its structure during the course of the centuries due to various different construction work. It was built close to the sea to allow monitoring of the coast from La Spezia al Porto in Livorno and powers along the via Francigena below, and thus enjoys an exceptional strategic position. Inside the impressive eight-sided tower, thanks to the construction of a glass floor, the archaeological finds from the dig below are clearly visible as well as the phases of fortification work of the basement of an ancient tower, dating from between the eighth to the tenth century. The most interesting pieces found have been put in the museum. The surrounding stronghold walls have been restored and the archaeological park within is now open to the public.