Lago di Massaciuccoli is a lake with a surface area of 6.9 square kilometres (2.7 sq mi), located mainly in the municipality of Massarosa and partly in Torre del Lago, a civil parish of Viareggio. The lake was known in ancient times as the Fossis Papirianis, a name used in the Tabula Peutingeriana. The composer Giacomo Puccini lived nearby and frequently hunted around the lake; today the Puccini Festival is held there annually in celebration. The springs of Bagni di Lucca, in valley of the Lima River, a tributary of the Serchio are known from the early history of Lucca as the Vicaria di Val di Lima, and Fallopius once claimed that the springs cured his own deafness.
Situated along the Via Francigena, a major Medieval pilgrimage route, the province is dotted with castles, abbeys, parish churches and villas such as the Villa Torrigiani and Villa Mansi.Lucca Cathedral, also known as the Duomo of San Martino, was originally built in the 6th century, but was rebuilt in the 11th century in the Romanesque style, consecrated by Alexander II in 1070. It was restored again with Tuscan Gothic influences in the 14th century, when columns of the upper arches were added. The Church of San Frediano, also in the city Lucca, is reputed to be only example of Lombard architecture preserved without notable alteration, although the façade dates to about 1200. The church contains some valuable pieces of art, as does the Manzi Palace and the 14th-century Church of San Francesco, which contains the tomb of the Lucchese poet, Guidiccioni.
The Case Guinigi and the Guinigi Tower of Lucca is a fine example of remaining medieval architecture in the province; construction began in 1384 to accommodate the wealthy Guinigi family. Paolo Guinigi was a ruler of the town a little later in the early 15th century. 44.25 metres (145.2 ft) high, it was built with sandstone and brick from Matraia and Verrucano from the Monti Pisani. Only one of the original towers remains, and loggia and the porch on the ground floor of it have been shut off.