The Ceiling is also all decorated.

Fontana dei Quattro Fiumi - Fountain of the four Rivers (the Danube, the Ganges, the Nile, and the Rio de la Plata) with Egyptian obelisk, in the middle of Piazza Navona

Sag eating roasted chestnuts in Piazza Navona. Roasted chestnuts are a street speciality in Rome this time of the year (February).