The public buildings and pleasure grounds, the splendid private houses and villas, with which the republic had begun to adorn the capital and its environs, grew from year to year, and became ever vaster and more elaborate. The Forum of Augustus, with the temple of Mars the Avenger, the sanctuary of Jupiter Tonans on the lower slope of the Capitoline Hill, the white marble temple of Apollo on the Palatine, the temple of Quirinus on the Quirinal Hill, and others of the same character, were among the most splendid edifices in the city. Magnificent colonnades perpetuated the names of the wife, sister, and grandsons of Augustus; the number of temples restored by him is estimated at eighty-two. The imperator’s example was imitated by his wealthy and powerful friends; Agrippa, whose services to the health and cleanliness of the city in the construction of the huge vaulted sewers (cloaca) have already been mentioned, perpetuated his name by a succession of magnificent gardens for the use and embellishment of Rome. He had two new aqueducts constructed, and he repaired the older ones that had fallen into decay; so that no town in the world had such an abundant supply of pure spring-water as ancient Rome, an advantage which the city enjoys to this day. He completed and adorned the Septa Julia which Cæsar had begun on the Field of Mars, for public assemblies and entertainments, and surrounded the space with three colossal and splendid edifices--the portico of Neptune, the Baths, and the Pantheon, the magnificent circular building in honour of Jupiter the Avenger and of Venus and Mars, the ancestors of the Julian family. Beams of bronze supported the domed roof with its gilded tiles, the walls and floor were lined and paved with marble. Even now the church of S. Maria Rotunda is among the most remarkable buildings of the city. The Diribitorium--the most spacious building ever constructed under one roof--where the populace received their corn allowance and voting tablets and the soldiery their pay, was the work of Agrippa.