In St. Peter's Square, you can find St. Peter's Basilica, the Swiss Guard, and the famous statues of both Peter and Paul, among tons of different vendors, according to EpicPew.
Almost 4 million Catholics visited the area in 2016, according to the Catholic Herald. Non-religious people also travel to this spot to look at the work fo Renaissance artists such as Raphael, Bernini, and Michelangelo, Travel + Leisure reports.