The atlas entry above is about the Greek Ephesus and the Temple of Artemis, one of the Seven Wonders. The same ruined city is also one of the most important sites of early Christianity, and that layer is worth setting out on its own.
Paul and the silversmiths. Paul spent some years at Ephesus in the 50s CE, and the Acts of the Apostles records the riot his preaching provoked among the silversmiths who made shrines of Artemis and saw their trade threatened, the crowd chanting "Great is Artemis of the Ephesians" in the theatre that still stands. The letter to the Ephesians is addressed to the community there.
John and Mary. A strong early tradition placed the apostle John's later life and death at Ephesus, and the great Basilica of Saint John was built over the site venerated as his tomb. A related tradition holds that Mary, entrusted to John, spent her last years nearby; the House of the Virgin Mary on the hill above the city is a Catholic pilgrimage shrine today, visited by several popes.
The Council of 431. Ephesus was the setting for the Third Ecumenical Council in 431, which affirmed the title Theotokos, "God-bearer," for Mary against Nestorius, a decision central to how mainstream Christianity came to speak of Christ and his mother. The council met in a church of Mary in the city.
The Seven Sleepers. On the edge of Ephesus is the cave of the Seven Sleepers, whose legend, of young Christians who slept through a persecution and woke generations later, is shared, in variant form, by Christianity and Islam, where it appears in the Sura of the Cave.