Caligula had two large ships constructed for himself (which were recovered from the bottom of Lake Nemi around 1930). The ships were among the largest vessels in the ancient world. The smaller ship was designed as a temple dedicated to Diana. The larger ship was essentially an elaborate floating palace with marble floors and plumbing. Thirteen years after being raised, the ships were burned during an attack in the Second World War, and almost nothing remains of their hulls, though many archaeological treasures remain intact in the museum at Lake Nemi and in the Museo Nazionale Romano (Palazzo Massimo) at Rome.