Above the Piazza della Signoria, at the highest point of the town, is the Palazzo Ducale, erected by the dukes of Urbino in 1474-1480; the architect was, in all probability, Lucio da Laurana, to whom is due the palace at Urbino, which this palace resembles, especially in its fine colonnaded court.
The post office is a handsome sandstone building in Renaissance style; it is colonnaded on two sides with polished granite columns and surmounted by a clock tower, containing a peal of bells.
It is an old town, with narrow irregular colonnaded streets and some interesting old frescoed houses.
The plan of the temple may be supposed to have included a colonnaded court in front of the present facade, and pylon towers at the entrance; but these were never built, probably for lack of funds.
Below it, on the cliffs above the Anio, is a large building round a colonnaded courtyard in opus reticulatum built over the Via Tiburtina (which passes under it in an arched passage), generally known as the villa of Maecenas, but shown by the discovery of inscriptions to have been in reality the meeting place of the Herculanei Augustales, connected probably with the temple.