Analysis of information sources in references of the Wikipedia article "Unknown years of Jesus" in English language version.
St Augustine wrote to the Pope to say he'd discovered a church in Glastonbury built by followers of Jesus. But St Gildas (a 6th-Century British cleric) said it was built by Jesus himself. It's a very very ancient church which went back perhaps to AD37
Jesus' putative travels to India and Tibet, his grave in Srinagar, Kashmir, and so forth. Scholarship has almost unanimously agreed that these references to Jesus are so late and tendentious as to contain virtually nothing of value for understanding the Historical Jesus.