This was my favourite tourist attraction in Rome. Very close to the Vatican with superb views of St. Peter's Basilica.The entrance fee is €7 for EU citizens between 18-25 and €14 for everyone else.There is a free audioguide provided in the form of an app with Bluetooth way points that activate when you walk into the correct room. It works exceptionally well.There is a coffee shop with amazing views of St. Peter's Basilica and a rooftop terrace with a view over the entire city. I really recommend coming in the evening to see the city and monuments lit up.