ロレンツォ・ギベルティ
The city is mostly built of brick, since the local sandstone deriving from Apennines erodes very rapidly. Its principal monuments include the medieval "Palazzo Comunale", the tall civic tower or "Torre Comunale", and the "Pinacoteca Comunale", an art museum with mostly Renaissance works by Raphael, Luca Signorelli, Andrea della Robbia, Lorenzo Ghiberti, Domenico Ghirlandaio, and others, notable for its external decorations by Giorgio Vasari.