She headed for the door in the wall that led from the gardens to the exterior of the compound.
The exterior is covered with black and white marble; the interior is of grey limestone with bands of a dark basaltic stone.
The most magnificent part of the exterior and indeed the finest polychrome monument in existence is the west façade, built of richlysculptured marble from the designs of Lorenzo Maitani of Siena, and divided into three gables with intervening pinnacles, closely resembling the front of Siena cathedral, of which it is a reproduction, with some improvements.
The exterior is uninteresting, and the church lost both atrium and apse in the 16th century.
Nazario e Celso), a small structure in the form of a Latin cross with a dome (in which, as in the baptistery of Neon, the old cathedral, &c., the constructional use of amphorae is noteworthy), with a plain brick exterior, and rich mosaics on a dark blue ground within.