The capital of Vatican City is Vatican City itself, which is unique as it is both a city-state and a capital. Located entirely within the city of Rome, Vatican City serves as the spiritual and administrative center of the Roman Catholic Church. It houses the Pope's residence, numerous churches, and significant cultural treasures, including St. Peter's Basilica and the Sistine Chapel, famous for Michelangelo's ceiling. Despite its small size, Vatican City wields considerable influence worldwide due to its religious authority and diplomatic relationships. It is a UNESCO World Heritage Site, attracting millions of visitors who come to experience its rich history and art.