1. Siena Historic Center, also known as Siena Centro Storico in Italian, is a UNESCO World Heritage Site located in the city of Siena, Tuscany, Italy. It is renowned for its well-preserved medieval architecture, stunning Gothic buildings, and its famous Piazza del Campo.

The center of Siena is characterized by its narrow, winding streets that lead to the beautiful main square, Piazza del Campo. The square is famous for hosting the annual Palio, a historic horse race that takes place twice a year and attracts visitors from all over the world.

The Historic Center is also home to important landmarks such as the Cathedral of Siena (Duomo di Siena), which is known for its spectacular black and white striped marble façade and intricate mosaics. Another notable site is the Mangia Tower (Torre del Mangia), offering panoramic views of the city from its 88-meter height.

2. The Historic Center of Siena is open to visitors throughout the year. The opening hours of the attractions within the city may vary, so it is advisable to check with specific sites for their opening times.

Phone: +39 0577 292011 (Tourist Office of Siena)

3. There is no specific entrance ticket for the Historic Center of Siena itself, as it is a public area. However, entrance fees may apply to visit certain attractions within the center, such as the Cathedral or the Mangia Tower.

Transportation to Siena Historic Center is easily accessible. Visitors can reach Siena by train from major cities in Italy, and then easily walk to the historic center. If arriving by car, there are parking areas near the city walls where visitors can park and then explore the center on foot. Additionally, there are bus services available for those who prefer public transportation.