The basics: There is a dress code to get into most of Rome’s cathedrals, including St. Peter’s Basilica. No shorts, short skirts, bare shoulders, or excessively open tops (too much cleavage). To get into the Basilica, you’ll need to get into the line on the right side of the Basilica; as you are looking at it. If you are questioning your wardrobe, the metal detector attendant is not the final say whether you get in or not. There is another set of attendants specifically there to screen out inappropriately dressed individuals. Bottom line is, don’t stand in line for fifteen minutes to get sent back. Wear tasteful clothing.
Once passed through the fashion police, if you go straight, you’ll find some restrooms and a place to check any bags or items you are carrying. Baby strollers will have to be checked. There also is a section there to rent audio tour guides for inside the Basilica and the Dome (5 € plus I.D.).
Go up the stairs and you will be at the front of the Basilica. If you go straight, it’ll take you inside St. Peter’s. If you follow the path to the right, you’ll find another line to go up to the Dome on top of St. Peter’s. I highly recommend going up there. The costs to get to the dome are: 5 € to use the lift (elevator) or 4 € to use the stairs. I suggest you pay the extra euro. There are over 300 steps including the lift. And these are no ordinary steps; you’ll go through spiral stairwells, slanted hallways, and tight corridors. If you are extremely claustrophobic, you may not want to take this tour. Small children will also need help getting to the top. At the top, you have the best view of Rome. You’ll have a 360-degree view of the area too. Check out the rest of Vatican City from there. When you get back down, you’ll end up in front of the Basilica again.
As soon as I walked into St. Peter's Basilica, I was at a loss for words. I have never seen such an impressive building in my life. The first thing I know about was, "man, that’s a lot of marble." Allow yourself plenty of time to explore inside. There are several sculptures and monuments to Popes of the past. See the famous alter centered over the original burial site of St. Peter. As you stand in front of the altar, look for some stairs to your back left. They are right next to a large sculpture. I missed them the first time in was there. They will lead you below to see some sarcophagus of Popes past and I think the restored site of St. Peter’s burial.