Vatican and Colosseum tips
For the Colosseum, make sure to get a tour for 8 euro after you skipped the line with your combo ticket from the Palatino... it takes you to 3 areas you can't get to any other way. The tour has to be from the actual Colosseum payed tour guides. They are the only ones with the keys. Not the other guys ripping you off outside. The tour takes you to the middle level 1 platform, the sub-level area, and the third floor. Normal access is the first and second floors around the sides.
Insider Tip:Vatican Museum: Make sure to go to the Vatican Museum first before the St. Peters Basilica. Days to go in order are Tues, Thurs, Fri, Weds, Mon, Sat, Free Sun. Tuesday being the best and Free Sunday (last Sunday of the Month) being the most horrible. Don't go in the morning, the line is stupid long. Go between 12-4. For the Colosseum, don't buy tickets there. Go to the Palatino in the morning and go to the Colosseum in the afternoon and skip the line.
