Palazzo Valentini

The Palazzo Valentini is the house of the government administration in Rome.  It is very close to Piazza Venezia.  The government website is here:  Metropolitan City of Rome

The official website for the ancient ruins at Palazzo Valentini is here:  Ancient Roman Domus of Palazzo Valentini  Under the Palazzo Valentini is ancient ruins of two houses and a temple.  You can visit the ruins for 15 euro every day except Tuesday.

Their google maps location is here:  Palazzo Valentini