Vatican City is the world's smallest country, located within the city of Rome, Italy, and serves as the center of the Catholic Church. It is the seat of the Papacy and holds great significance for Catholics. St. Peter's Basilica, the main church, is one of the largest church buildings in the world and is decorated with numerous altarpieces and statues. The Vatican Museums, which include the Raphael Room filled with frescoes and the Sistine Chapel famous for Michelangelo's ceiling paintings, are also popular tourist spots.