Siena Cathedral, also known as Cattedrale di Santa Maria Assunta, is a stunning example of Italian Gothic architecture located in Siena, Italy. Construction began in the 12th century and continued for several centuries, resulting in a richly decorated façade and an intricate interior featuring black and white striped marble. The cathedral is renowned for its beautiful artworks, including works by Michelangelo and Donatello. The interior of the cathedral houses the famous Piccolomini Library, adorned with frescoes by Frescoes by Pinturicchio. Visitors can also admire the stunning floor mosaics that depict various biblical scenes. The cathedral is a UNESCO World Heritage Site and remains a significant cultural and historical landmark in Tuscany.