The Piccolomini Library is a library within the cathedral in Siena, Italy. The library was designed in the 1400s, and visitors can admire the beautiful ceiling that is covered in frescoes painted by Pinturicchio in 1502. The colorful frescoes depict images of figures in luxurious clothing, indoor settings, and detailed landscapes. The walls show important stages of the life of Pope Pius II in ten different sections. Some of the parts of his life that you can see painted here include when he was an ambassador to the European courts, paying homage to the new Emperor and then to the Pope at the time, presenting Eleonora of Aragon to the Emperor Frederick III, becoming a cardinal, and then becoming the Pope.
The library was built by Pope Pius III to house the manuscripts of Enea Silvio Piccolomini, his uncle who was Pope Pius II before him. Though most of the manuscripts are not here, visitors can see several hand-designed volumes on display.