Basilica of Santa Cristina and its catacombs

In this basilica, at the entrance to the old town of Bolsena, a priest from Prague who doubted the real presence of Christ saw the host bleed during mass. Pope Urban IV had the miracle examined and afterwards extended the feast of Corpus Domini to the whole Church. Inside is the tomb of St Christina, virgin and martyr, and beneath it the catacombs, which can be seen on scheduled guided tours; individuals and families can sign up on the basilica's website, and only groups of more than 15 need to book. Check the mass times before you go.