Combine several of Rome's most-visited highlights—climbing St. Peter's Dome and the interior of the Basilica  on a single tour with a guide. You'll also get the rare chance to visit the the papal crypts and the vatacombs, stops that aren't typically included on standard tours. This tour includes a lot of stairs, and although there are plenty of rest breaks, it is best for those in decent physical shape. As you explore the sites, you'll learn about the Vatican's history and religious significance.