Spina. A small white marble church alongside the Arno, is attributed to Lupo di Francesco (1230), is another excellent Gothic building. San Paolo a Ripa d'Arno. The church was founded around 952 and enlarged in the mid-12th century along lines similar to those of the cathedral. It is annexed to the Romanesque Chapel of St. Agatha, with an unusual pyramidal cusp or peak. San Pietro in Vinculis. Known as San Pierino, it is an 11th-century church with a crypt and a cosmatesque mosaic on the floor of the main nave. . This medieval borgo or neighborhood contains strolling arcades and the Lungarno, the avenues along the river Arno. It includes the Gothic-Romanesque church of San Michele in Borgo (990). There are at least two other leaning towers in the city, one at the southern end of central , the other halfway through the riverside promenade. Medici Palace. The palace was once a possession of the Appiano family, who ruled Pisa in 1392–1398. In 1400 the Medici acquired it, and Lorenzo de' Medici sojourned here. . The botanical garden of the University of Pisa is Europe's oldest university botanical garden. . The ("Royal Palace"), once belonged to the Caetani patrician family. Here Galileo Galilei showed to Grand Duke of Tuscany the planets he had discovered with his telescope. The edifice was erected in 1559 by Baccio Bandinelli for Cosimo I de Medici, and was later enlarged including other palaces. The palace is now a museum. . This palace is a 14th-century Gothic building, and now houses the offices of the municipality. The interior shows frescoes boasting Pisa's sea victories. . The palace is a Gothic building also known as , with its 15th-century façade and remains of the ancient city walls dating back to before 1155. The name of the building comes from the coffee rooms of , historic meeting place founded on September 1, 1775. Mural . A modern mural, the last public work by Keith Haring, on the rear wall of the convent of the Church of Sant'Antonio, painted in June 1989. Museums : exhibiting among others the original sculptures of Nicola Pisano and Giovanni Pisano and the treasures of the cathedral. : showing the sinopias from the camposanto, the monumental cemetery. These are red ocher underdrawings for frescoes, made with reddish, greenish or brownish earth colour with water. Museo Nazionale di San Matteo: exhibiting sculptures and paintings from