St. Peter's Basilica
Saint Peter's Basilica, the world's largest church, is the center of Christianity. The imposing structure was built over a span of more than one hundred years by the greatest Italian architects of the era.
The church is built on Vatican Hill, across the Tiber river from the historic center of Rome. The location is highly symbolic: this was the site where Saint Peter, the chief apostle, died a martyr and where he was buried in 64 AD. St. Peter is considered the first pope, so it made perfect sense for the papacy to build the principal shrine of the Catholic church here.