The central feature of Verona's Centro Storico is the rectangular Piazza delle Erbe, one of the most picturesque squares in Italy. It stands on the site of the Roman forum, and is now a fruit and vegetable market. In the center of the square is the 16th-century Berlina, a canopy on four columns, formerly used for elections. To the north of it is a fountain from 1368 with the Madonna di Verona, an ancient marble statue that was repurposed in medieval times.At the north end of the square, a marble column holds the lion of St. Mark, the emblem of Verona's former Venetian rulers. At the northeast corner stands the Casa Mazzanti, originally built by the Scaligeri. Like many houses here, it is adorned with Renaissance frescoes. On the north side of the square is the Baroque Palazzo Maffei from 1668, and to the left of this, the 1370 Torre del Gardello. The Casa dei Mercanti at the corner of Via Pellicciai was rebuilt in 1878 in its original 1301 form. Opposite rises the 84-meter-high Torre dei Lamberti, with a medieval bell, El Rengo. A lift from the courtyard side takes you to the top for one of the best bird's-eye views of the old town. From the end near the lion of St. Mark, Corso Porta Borsari is interrupted by Porta dei Borsari, a Roman city gate built in the first century AD and restored in 265.