Lucca is a unique city, quite different from the rest of Tuscany. It was a major center during the medieval period, but was bypassed and became a bit of a poor backwater during the Renaissance. During the Renaissance, throughout Tuscany old medieval buildings were replaced with architecture in the "modern" Renaissance style, but that didn't happen in Lucca. It's next major building boom didn't happen until the late 1800's and early 1900's, the period of the "Liberty" (Italian Art Nouveau) style. As a result, the city is a unique mix of Romanesque and Art Nouveau. Known as the city of 100 churches, the presence of so many churches and convents makes it a singular conservative city in the liberal bastions of Tuscany. It is full of beautiful villas with well maintained gardens, and you can climb the Guinigi Tower, with a garden on the roof, for a wonderful view. It is a enclosed city- the high dirt embankments form a grass covered wall surrounding this old town, and you can walk the path on top of that wall. Vehicular traffic is strictly limited inside the walls, and so it is a very pedestrian friendly town.