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The Casalecchio sluice is an imposing hydraulic work located on the Reno river, with a 160m long, 35m wide slide and a drop of 8.25m. It was created in the mid-14th century to divert part of the river's water into the Reno Canal and bring it into the city. The use of water as a driving force enabled Bologna in the Middle Ages to experience fabulous economic growth by harnessing it to power silk mills and other factories. The sluice, symbol of the motive power behind the flourishing growth of the city, has also taken on a symbolic value of equal strength and importance, by being included at the end of 2010 in the list of UNESCO's 2000-2010 programme of World Heritage Sites for a Culture of Peace for Young People. The point of interest shown on the itinerary leads to the "Prato Piccolo"park , the site of a former barrage destroyed in 1325, with a series of fascinating views over the sluice and its associated buildings, such as the guardhouse with spillway known as Pracinino ("prà znein" in dialect).