Bow your head, say a prayer and perhaps even light a candle in Lucca Cathedral Museum. This grand religious building may not always be accessible, so check ahead for hours if you'd like to go inside.
Wandering around this principal church won't cost a penny, which is fantastic news if you're chasing free things to do. You'll find Lucca Cathedral Museum in Lucca Historical Center. There are plenty more places to visit not far away, including Guinigi Tower, Piazza dellAnfiteatro and Church of San Michele in Foro.