There is no words, none… nothing can prepare you for the beauty you are about to see in Rome. I was speechless and I always have something to say ! You are surrounded by masterpiece after masterpiece of every possible art you can imagine. From renaissance every great artist left a piece of his genious work like the Last Judgement by Michelangelo at the Sistine Chapel, Raphael´s Transfiguration, Gallery of Maps, Gallery of the Statues….. Check there site (idiom site) www.museivaticani.va and decide what do you want to see because it´s impossible to see it all .
The biggest museum in the world, which means the biggest waiting line in the world, (not joking), but don´t let it discourage you. I would recommend guided tours, they offer them on every corner. You will pay a little bit more (cca 50 € for an adult, students 45 €, children 41 €) but that way you´ll bypass the waiting line, you´ll get the most of it since they are 4 hours long and lessons of history and art are worth every moment. Just so you know, you are not allowed to take pictures in the Sistine Chapel.
I can´t describe you every single piece of art, I hope my photographs will show just (definition just in case) a glance of beauty hidden in this amazing museums and to inspire you to take this trip and leave as a completely different person.