Siena Cathedral, also known as the Duomo, is a stunning Romanesque and Gothic masterpiece located in the heart of Siena, Italy. With its rich history dating back to the 9th century, the Cathedral boasts an impressive collection of sculptures, paintings, and stained glass windows by renowned artists like Nicola Pisano, Donatello, and Michelangelo. Visitors can marvel at the intricate marble mosaic floor, exquisite frescoes, and beautiful choir stalls while soaking in the spiritual and artistic beauty of this iconic landmark.