The building where Michelangelo sculpted his world-famous David is now a Museum of the Works of the Cathedral di Santa Maria del Fiore. The great artistic tradition of Florence is visible at the Museo dell’Opera del Duomo. The museum possesses the world’s largest concentration of Florentine monumental Renaissance sculptures, including works by Donatello, Andrea del Verrocchio, Michelangelo Buonarroti, and many others including the original Lorenzo Ghiberti's doors for the Baptistery - "Gates of Paradise". Not many people know that the ones installed at the Baptistery outside are actually a copy, substituted to preserve the panels after five hundred years of exposure and damage. The world-class museum offers a great close-up view of the Duomo and a nice caffetteria. Next to the Museo dell’Opera del Duomo lies the Cattedrale di Santa Maria del Fiore (Florence Cathedral). This UNESCO World Heritage Site is known for its exquisite Gothic architecture and Christian artwork. While some of its original works are now placed at the Museo dell’Opera del Duomo, the cathedral includes elaborate frescos and sculptures as well.