Most of the streets are narrow and crooked, and the majority of the houses have their gables turned towards the street.
The streets are narrow, and the houses are mostly picturesque old structures, built of wood, with many quaint gables and dark archways.
The galley-slips around Zea were roofed by a row of gables supported by stone columns, each gable sheltering two triremes.
A few, however, preserve antique narrow fronts with gables, as in some of the North German towns.
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.