b"For the latest version of this audio tour, download the (free!) Rick Steves' Audio Europe\\u2122 App \\u2014 available for Apple and Android. Learn more at https://www.ricksteves.com/watch-read-listen/audio/audio-europe\\nThe greatest church in Christendom has a cavernous interior, a grave of St. Peter, and the Pieta \\u2014 all under the watchful presence of Michelangelo's magnificent dome."