The Piazza Venezia is a piazza in central Rome, Italy. It takes its name from the adjacent Palazzo Venezia, the former embassy in the city of the Republic of Venice.
The piazza is at the foot of the Capitoline Hill and near the Roman Forum. It is dominated by the imposing Monument to Vittorio Emanuele II. In 2009, during excavations for the Rome C Metro Line, ancient remains of what has been identified as emperor Hadrian’s Athenaeum were unearthed in the middle of the square.
source and more info @: http://en.wikipedia.org/wiki/Piazza_Venezia