The Nemi ships were two pleasure barges, one larger than the other, built under Caligula at Lake Nemi. Although there were several attempts to recover them from the 15th century onwards, it wasn’t until 1929 that Mussolini ordered the whole of Lake Nemi would be drained and they were recovered and housed in a museum. And then the Americans decided to drop bombs on them, and they were destroyed, lost forever.