The Church of St. Anne, according to Wikipedia, is a Roman Catholic church located at the start of the Via Dolorosa, near the Lions' Gate and churches of the Flagellation and Condemnation, in the Muslim Quarter of the Old City of Jerusalem.
St. Anne's was built by Crusaders around 1140, near the ruins of an earlier Byzantine church built and over a grotto in which, the Crusaders believed, Anne, the mother of Mary, was born.
The Byzantine church, in its turn, had been built over the ruins of a pagan "healing" temple to either the Egyptian Serapis or the Greek Asclepeion.
Pools at that still earlier temple are believed by Christians to be the Pools of Bethesda, where Jesus healed a sick man (John 5:2-9).