One of the oldest buildings in Florence, it's thought that the octagonal Baptistery stands on the site of an ancient Roman temple. It may even have been built as early as the 5th century. The striking Romanesque cladding of white and green marble was added in the early 12th century.
Inside, the Baptistery features gold mosaics, marble columns and tombs. Look up to catch the best views of the gilded mosaics covering the cupola.
Perhaps the Baptistery's most famous attraction is its trio of gilded bronze doors, decorated with panels. Examine the panels up close to admire their incredible details.