Jardines del Turia, Spain

The Turai river used to flow through the centre of Valencia. Following a particularly bad flood in 1957, the river was rerouted around the city and the river bed was made into a path. It make for a thoroughly enjoyable experience, cycling through the city in one huge garden which is overlooked by magnificently majestic bridges. The experience culminates at the 'Ciudad de las Ciencias', where water meets futuristic architecture to quite impressive effect.
Photo credit: Juanedc (flickr.com)