Baptistry of San Giovanni (Battistero di San Giovanni)

The largest baptistery in Italy stands 54.86 meters tall with a circumference of 107.24 meters. Construction started in 1152 and took over 200 years, which is why you can read the building's entire architectural evolution on its facade: Romanesque arches at the bottom, Gothic pinnacles up top. Step inside and wait for a custodian to demonstrate the acoustics. The circular marble interior produces a natural echo that sustains for about eight seconds, turning a single sung note into a full chord. The effect is genuinely stunning and worth timing your visit around (demonstrations happen roughly every 30 minutes). Open daily 9:00 AM to 6:00 PM, admission is €6.






