St. Peter's Cathedral is on the side of St. Peter's Square. There are always many people in the queue. We took more than half an hour to get in. Church can climb the top, which can be divided into stairs and elevators. Tickets are different, but no matter what kind of ticket, they still need to climb more than 300 steps by themselves. However, compared with the scenery after climbing the top, the cost of tickets and physical strength are very worthwhile.