Every year, people from around the world flock to Abadiania, Brazil, the remote village that's home to John of God's healing center, the Casa. Some come seeking spiritual growth; most are hoping for a medical miracle. Oprah traveled 6,000 miles to see John of God's controversial practices firsthand. Watch as she observes a shocking physical surgery—and find out why she had to sit down. Plus, a Swedish follower shares his experience.