A floating mill usually consisted of two vessels, one with milling machinery, one used for storage, with an undershot water wheel between them. The earliest known was used by the defenders of Rome during the siege of the city by the Ostrogoths in ad 537. They were employed in many parts of Europe, particularly on the River Danube and its tributaries. A mill at Kolarovo, located on ‘Rye Island’, between the Little Danube and the River Vah, ceased work in 1965, but was restored from 1980, and is now conserved as a museum. In the same vicinity is an 86 m long covered wooden bridge.