Meet your guide and climb to the top, courtesy of your priority entrance. Hear how the construction of the Duomo began at the end of the 13th century and took 2 centuries to complete. Marvel at the marble floors but don't forget to look up - the frescoes above are just as immense.
After your tour of the Dome, feel free to explore the rest of the five sites as your ticket for the complex will be valid for 3 days. After exiting the Cathedral, you can line up to re-enter the Cathedral and explore in your own time.