The cathedral's 13th-century bell tower, with its comically oversize crenellations added in the 18th century, can be spotted for miles around. The cathedral is a pleasingly bare-walled medieval church, built in 1028 using columns from nearby Roman buildings. The crypt is supported by slender columns with primitive carvings on the capitals. The remains of St. Romolo, Fiesole's patron, reside under the altar, and 15th-century lunette frescoes tell his story. There's a spot near the front of the crypt where you can see through the floor to a bit of Roman road and column bases, discovered during restoration in the early 1990s.