Eyüp Sultan Mosque stands as a central landmark in this area of the city. It is considered the holiest Islamic shrine in Istanbul. The mosque is part of a larger complex that draws visitors from across the world, especially those eager to connect with the city’s spiritual past.
Next to the mosque lies the tomb of Abu Ayyub al-Ansari, known locally as Eyüp Ensari Türbesi. He was the standard-bearer of the Prophet Mohammad and played a significant role during the first Muslim siege of Constantinople, which took place between 674 and 678 AD. After his death, he was buried at this site, and the entire neighborhood was named in his honor.
The tomb attracts large crowds of Muslim pilgrims year-round. It is not uncommon to see lines forming outside, with people waiting several minutes for a chance to enter. Inside, visitors will find a plastic plaque said to bear the footprint of the Prophet Mohammad, though it is a simple display and often seen as less impressive than the rest of the site. However, the interior decoration of the tomb is worth attention. Its walls are covered in beautiful tiles and faience, offering a rich visual experience for those who enter.
The site is also notable for its unique customs. Many devout Muslims leave the tomb by walking backwards through the exit hallway, a gesture of respect so they do not turn their backs on al-Ansari’s catafalque. While not everyone follows this tradition, witnessing it adds another layer of meaning to the visit.
Source - https://en.wikipedia.org/wiki/Ey%C3%BCp_Sultan_Mosque