Fodor's Expert Review Basilica di San Francesco

The basilica isn't one church but two: the Gothic church on the upper level, and the Romanesque church on the lower level. Work on this two-tiered monolith was begun in 1228. Both churches are magnificently decorated artistic treasure houses, covered floor to ceiling with some of Europe's finest frescoes: the Lower Basilica is dim and full of candlelight shadows, while the Upper Basilica is bright and airy.

In the Upper Church, the magnificent frescoes from 13th-century Italian painter Giotto, painted when he was only in his twenties, show that he was a pivotal artist in the development of Western painting. The Lower Church features frescoes by celebrated Sienese painters Simone Martini and Pietro Lorenzetti, as well as by Giotto (or his assistants).