Kucuk Ayasofya Camii (Church of the Saints Sergius and Bacchus)

This is most welcoming mosque in all of Istanbul (for non-muslims) and I've been in many of them during my one week stay in the city.
Big thanks for this to caretaker Mehmet, who was very friendly and helping.

Not like big Sophia you can go anywhere inside, including upper gallery (suppose not at praying times).

Though almost nothing left from byzantine era interiorwise, except greek inscriptions running round perimeter between floors, it's well worth visiting.

This cute mosque is located just about 50 m away from the water (but there is a busy road in between). It is located down hill from the far end of the hippodrome obelisks near Sultanahmet.

Inside the Kucuk Ayasofya there were little corners to hide away and read books.

This was built as a church during the time of Justinian, and was used to prototype some of the designs for the Hagia Sophia. It was converted into a mosque after the conquest, and has been extensively renovated since, so it now only bears a marginal resemblance to the Hagia Sophia. But it’s a nice place and worth visiting if in this part of Istanbul.

The former church dates back to 536 AD and was built by Justinian for two saints, Sergius and Bacchus. The name of the current mosque has been chosen as a small Hagia Sophia because of its resemblance to Hagia Sophia. Of course, this church was built before Hagia Sophia. Although most of the mosaic ornaments of this place have been lost, the Greek inscription of Justinian, his wife Theodora and all the saints can still be seen in the row of inscriptions.

We sought out this mosque after reading reviews on it and it was indeed a beautiful find. We had a chance to pray in it and loved the tranquility and peace it emitted. The design and architecture is a must see for any visitor. Unfortunately, we did not see anyone there who could give us more history on the mosque, but it was wonderful to just visit and pray in.

Another must see mosque in Istanbul. This is older than the Hagia Sofia and like that building has been converted to a mosque from a church. As you look around you can see evidence of its former use. It’s very beautiful inside and not far from Hagia Sofia.

It was a Greek Eastern Orthodox church but was converted into a mosque during the Ottoman Empire. The building architect is just amazing and stunning. Although it is not a huge building but it is difinetely worth to visit to this place. Hope that human stays harmony despite of the our religions.

Both the church and the mosque are in silent agreement with each other.I do not understand why there are still religious wars.Come here and see this greatness with your eyes

This little jewel is hidden away, and takes some finding, but your efforts are well rewarded.
Bult by Emperor Justinian before the Aya Sofia and dedicated to Saints Sergius and Bachus, it was converted to a mosque after the conquest. Recently renovated and recarpeted, the interior is stunning in its harmony and simplicity. Unlike the Aya Sofia which is dark inside, this is flooded by natural light. The garrulous old caretaker demanded baksheesh, but his performance made it worth the cost.
We were the only visitors there and enjoyed the serenity which infused this sacred space.

So nice and calme mosque not crowded free entrence 24h opens with small garden outside and very nice resraurant next to it i suggest for every body