St. Peter's Basilica is one of the holiest sites in Christianity. It is traditionally believed to be built on the burial site of St. Peter, one of Jesus' twelve apostles and the first Bishop of Rome (Pope). The basilica holds great religious and historical importance for Catholics. The basilica is renowned for its splendid Renaissance and Baroque architecture. It was designed by leading architects such as Donato Bramante, Michelangelo, Carlo Maderno, and Gian Lorenzo Bernini.

The Vatican Grottoes, located beneath St. Peter's Basilica in Vatican City, are a sacred and historically significant underground complex. This subterranean space serves as the final resting place for numerous popes, saints, and important figures in the history of the Catholic Church. Visitors to the Vatican Grottoes can explore a labyrinth of burial chambers and tombs, including the traditional resting place of St. Peter, one of Jesus' apostles and the first Bishop of Rome (Pope). The caves are adorned with artistic and decorative elements that reflect the rich heritage and religious significance of the Catholic faith. Accessible to tourists and pilgrims, the Vatican Grottoes offer a unique opportunity to delve into the history of the Church and pay homage to its revered figures. These underground chambers are a place of reverence, reflection, and historical exploration, offering a deeper understanding of the enduring legacy of the Catholic Church.

St. Peter's Dome, also known as the Dome of St. Peter's Basilica, is an iconic architectural masterpiece located in Vatican City. Designed by the famous Renaissance artist and architect Michelangelo Buonarroti, this majestic dome is a symbol of both artistic and engineering excellence. The dome boasts impressive dimensions, with an outer diameter of approximately 42 meters (138 feet). It reaches a remarkable height of approximately 132 meters (434 feet) from the ground to the top of the cross.