Window of Peace because from its large windows you will admire three bell towers and the statue of the Madonna, above the last remaining column of the temple of Maxentius (temple of Peace).
Ancient Praetorian barracks (to defend the Colosseum and the forums) preserves a Roman column in the atrium, a building of particular historical interest and unique in its kind.
Not only are you in the center of Rome but of all of Italy, 1.32 hours Florence, 1.13 hours Naples and 3.35 hours Venice, 50 meters from Termini station.