Then we walked to the nearby St. Peter's Cathedral, which was built between 1160 and 1232. Near the closing time, we became the last visitors to the cathedral. Later, I found out that the symbolic building, apart from the appearance of a variety of architectural styles, the original building was built in Roman style, its arch was Gothic, and the 18th century added the main entrance was Greek-Roman cylinders and the dome of the Pantheon similar to Rome. Beneath it lies Europe's largest underwater monument open to the public, which will enable visitors to understand how the cathedral evolved from a simple chapel to its present size.