Fodor's Expert Review Duomo

This 15th-century cathedral was built by the architect Bernardo Rossellino (1409–64) under the influence of Leon Battista Alberti. The travertine facade is divided into three parts, with Renaissance arches under the pope's coat of arms encircled by a wreath of fruit. Inside, the cathedral is simple but richly decorated with Sienese paintings. The building's perfection didn't last long—the first cracks appeared immediately after it was completed, and its foundations have shifted slightly ever since as rain erodes the hillside behind. You can see this effect if you look closely at the base of the first pier as you enter the church and compare it with the last.