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Since the Middle Ages it had been known that at the bottom of the lake were the boats of Caligula that made up the artificial island where the emperor had his festive palace in honour of Diana. Over 30 years the ships were recovered and are on display in a museum specially built for them. The museum caught fire during the Second World War and is now rebuilt along with scale models 1: 5 of the Roman ships. Inside there is also a section dedicated to the findings of the area of Colli Albani.