A former Roman settlement, Padua's importance grew during the 13th and 16th centuries when it had become the second biggest university city in Europe. Dante and Copernicus studied here, Petrarch and Galileo taught here. It has a picturesque atmosphere. "Basilica di Sant'Antonio" with the grave of "Sant'Antonio" is the most important attraction. Here one can also admire works by medieval and renaissance artists, such as Giotto. The Prato della Valle, the biggest square in Europe is worth a visit.