The Basilica of St. John is an outstanding monument of Byzantine architecture located on the picturesque Ayasuluk Hill in the city of Selçuk, Turkey. This ancient sanctuary was built in the 6th century by Emperor Justinian I in honor of the Apostle John the Evangelist, one of the closest disciples of Jesus Christ. According to tradition, it was here, in the vicinity of ancient Ephesus, that the apostle spent his final years and was buried, and the basilica was built on the site of his presumed tomb.

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Even though the basilica has reached us in ruins, its scale and surviving architectural details make an indelible impression. Visitors can see the remains of massive walls, majestic columns, and elegant arches that once supported a massive dome. The complex also includes the ruins of a baptistery, a treasury, and a chapel where frescoes depicting biblical stories could once be seen.
The Basilica of St. John has immense religious and cultural significance. This site is not only a world-class historical monument but also an important pilgrimage center for Christians from all over the world. Every year, thousands of tourists come here to touch ancient history, explore the impressive ruins, and feel the special atmosphere of this holy place, which offers a beautiful view of the surrounding area, including the ruins of the Temple of Artemis and Selçuk Fortress.