I liked the way the light configuration in the storm clouds echoed the shape of the staircase in reverse.
On the lower left is an entrance to the lower church with frescoes by Simone Martini, Lorenzetti and others.
Visitors can also visit the tomb of St. Francis in the lower church.
The upper level opens into the nave, with Giotto's famous frescoes of the life of St. Francis.
Behind the church is the cloister and monk's quarters as well as a large bookshop.