Interestingly, the work was so vast and intense, that nearly 2,000 workers were needed per day and people from the surrounding countryside were required to lend a hand at least once a week! The walls count 12 enceintes with ramparts, 11 bastions and 6 dates (there were only 3 originally) and stretches for 4.2 km around. They were never used for defensive purposes, in the end, apart from one occasion, though it might not be what you think! When the River Serchio flooded in 1812, all the gates were closed and reinforced, saving the city.
When the new Duchy of Lucca was entrusted to the Borbone family from Parma in 1815, Duchess Maria Luisa appointed the architect Lorenzo Nottolini to transform part of the walls into a green space, which was later turned into a full-blown public park in the late 1800s. Today, the walls boast many spots to play and relax, especially around the bastions and ramparts, equipped with benches, tables, drinking fountains and games for children.