There is a magnificent aqueduct constructed by Nottolini (1823-32) found to the south of the walled part of Lucca. It was just a couple of minutes from the apartment where I stayed.
Water was collected from springs on the northern slope of Mount Pisano, filtered through sand and gravel and carried to Lucca via this aqueduct. It was held in the San Concordia tempio, pictured below.
There is an easy walking path along the aqueduct, it would be a great place to take a bike ride!
Nowadays, you will notice many water fountains in Lucca, with locals refilling bottles and containers. The water comes from the mountains between Lucca and Pisa, called “Monti Pisani“. My landlady told me it is tested regularly, and that it tasted much better than the water piped into the houses. She was right!