Castel Sant'Elmo is a medieval castle, used as a museum, located on the Vomero hill. It was once called Paturcium and stands on the site where there was, starting from the 10th century, a church dedicated to Sant'Erasmo. This mighty building, partly obtained from the living rock, originates from a Norman observation tower called Belforte.
Due to its strategic importance, the castle has always been a highly coveted possession: from its position (250 m a.s.l.) you can control the whole city, the gulf, and the roads that lead to the city from the surrounding hills.