The Pisa Cathedral marks the zenith of the architectural power of Pisa at the time of its creation by having bits from the Islamic, Byzantine, Lombard-Emilian, and classical architecture. Lying peacefully in the Piazza dei Miracoli (Miracle Square), it gleams in multi-colors, courtesy of the different types of marbles that it is adorned with, especially cosmatesque marble.
Unlike the exterior, the cathedral’s interior depicts much more decorations and ornamentations.
The Romanesque façade of the cathedral is made of pastel-colored marble that is designed divinely by the students of Giambolongna.
While the three doors leading inside were constructed or cast after the deadly fire of 1595, an original door “The Door of San Ranieri” designed by Bonnano Pisano still stands and provides a way in from the southern transept.
By Alain – Full Story at Keep Calm and Wander