The city of Siena, located in the Tuscany region of Italy, is a cathedral city known for its medieval architecture and art. It is one of the most visited cities in the region and is home to the famous Palio di Siena, a horse race held twice a year in the city's main square. The city is also known for its many churches, including the Duomo di Siena, a Gothic-style cathedral built in the 13th century.