The Basilica of Santa Cristina occupies the site where, according to tradition, the early Christian martyr Cristina was tortured and thrown into the lake in the third century. The church was built and rebuilt over the centuries; the current facade dates from the early sixteenth century. Beneath the main church lie a series of catacombs and an ancient oratory with early Christian frescoes.
The chapel of the Miracle, within the basilica complex, marks the site of the 1263 Eucharistic miracle that prompted Pope Urban IV to institute Corpus Domini. The stone on which the miracle is said to have occurred is displayed here. The basilica is freely open and well worth the short walk from the main lakefront.