Santa Maria delle Grazie al Calcinaio sits in open countryside about a kilometre below Cortona's walls and is one of the masterpieces of Italian Renaissance architecture. Francesco di Giorgio Martini designed the cross-shaped church in 1485 around the strict geometric principles of harmony that defined late-Quattrocento taste.
The interior — bright, clean, and almost geometrically pure — is best seen in late afternoon light. A 20-minute drive from the historic centre, or a brisk walk down (the climb back up is hard). Worth the trip for serious enthusiasts of Renaissance architecture.