Florence contains numerous museums and art galleries where some of the world's most important works of art are held. The city is one of the best preserved Renaissance centres of art and architecture in the world and has a high concentration of art, architecture and culture. In the ranking list of the 15 most visited Italian art museums, ⅔ are represented by Florentine museums. The Uffizi is one of these, having a very large collection of international and Florentine art. The gallery is articulated in many halls, cataloged by schools and chronological order. Engendered by the Medici family's artistic collections through the centuries, it houses works of art by various painters and artists. The Vasari Corridor is another gallery, built connecting the Palazzo Vecchio with the Pitti Palace passing by the Uffizi and over the Ponte Vecchio. The Galleria dell' Accademia houses a Michelangelo collection, including the David. It has a collection of Russian icons and works by various artists and painters. Furthermore, other museums and galleries include the Bargello, which concentrates on sculpture works by artists including Donatello, Giambologna and Michelangelo; the Palazzo Pitti, containing part of the Medici family's former private collection. In addition to the Medici collection, the palace's galleries contain many Renaissance works, including several by Raphael and Titian, large collections of costumes, ceremonial carriages, silver, porcelain and a gallery of modern art dating from the 18th century. Adjoining the palace are the Boboli Gardens, elaborately landscaped and with numerous sculptures.