• Brief description: the oval shape of the square evokes an old Roman amphitheatre where games were held in the year 86. Nowadays, you can see the Sant'Agnese church in front of which Bernini built the Four Rivers fountain, adorned with figures that represent the 4 great rivers of each continent (the Nile, the Danube, the Ganges and the River Plate)
• Length of visit: 15min 
• How to get there: 20min from St. Peter´s Square. Cross the Sant'Angelo Bridge and from there you can get great views of the Castel Sant'Angelo.