Bernini's architectural works include sacred and secular buildings and sometimes their urban settings and interiors. He made adjustments to existing buildings and designed new constructions. Among his most well known works are the Piazza San Pietro (1656–67), the piazza and colonnades in front of St. Peter's Basilica and the interior decoration of the Basilica. Among his secular works are a number of Roman palaces: following the death of Carlo Maderno, he took over the supervision of the building works at the Palazzo Barberini from 1630 on which he worked with Borromini; the Palazzo Ludovisi (now Palazzo Montecitorio, started 1650); and the Palazzo Chigi (now Palazzo Chigi-Odescalchi, started 1664).