Inside the Basilica: What You Will See and Do Once you pass through security, you will step inside the largest and most breathtaking church in the world. You can walk at your own pace across the vast marble floors to admire the massive golden ceilings and the sun beaming through the towering windows.As you explore the heart of the Basilica, you will stand directly beneath the giant dome designed by Michelangelo. Right below it, you will see the famous bronze canopy standing over the grand altar. You will also get a close-up look at iconic art treasures, including Michelangelo's beautiful Pieta statue and the historic bronze monument of St. Peter.