Şeyh Fethullah Mosque and Kulliye (Lower Şeyh Mosque, Center): It is the most important ancient structure in Gaziantep, and at Şehreküstü District. According to its inscriptions, kulliye is composed of mosque, zaviye, hamam and theology school. We can also add the “castel”, which is another element of today’s kulliye, which has no theology school, and still active, to this complex.

Mosque, which gather first period Ottoman mosque plan perceptiveness successfully but with a different composition, has an important place within Turkish - Islam architecture especially with its dome.

There is a hand written Holy Koran, written by Şeyh Fettullah within the mosque.

Boyacı Mosque (Center): It is the oldest mosque of Gaziantep, and constructed by Boyacı Yusuf and Kadı kemalettin in 1357. Mosque, which belongs to Turkish Memluks, is very rich in connection with marble and tile adornments. Wooden balcony, which is the oldest sample of wooden craft of Gaziantep, has twelve branched stars, which are adorned with pelmet, rosette and geometric motifs.

Ömeriye Mosque (Center): It is written in the records that Gaziantep's Düğmeci District present mosque is repaired in 1210. It is told that mosque, which is not clearly known that by whom it is constructed, is constructed by Emevi Caliph, Ömer Bin Abdülaziz, grandson of Hz. Ömer, from his daughter, during Hz. Ömer period. Another name of the mosque is "Ömereyn" meaning 'two Ömers'.

On the parapets of minaret balcony, beautiful samples of the stone masonry can be seen.

Ahmet Çelebi Mosque (Center): It is at the Ulucanlar District. Founder of the mosque is Hacı Osmanoğlu Şeyh Ramazan Efendi, one of the descendants of the prophet. It is a kulliye, composed of theology school, mosque and castel. It is understood from its inscription that it is constructed in 1672. Wooden craftsmanship is interesting.

Yuşa Peygamber Mausoleum (Center): Yuşa Peygamber is one of the son of İsrail, and niece of Hz. Musa. He had saved İsrail oğulları from nomadic life and put them in Arzı Kenan. There are two mausoleums within two chambers of this building, which is at the Boyacı district, Pir Sefa site. One of these belongs to Yuşa prophet and other one belongs to Pir Sefa hazretleri.

Pir Sefa Hazretleri Mausoleum (Center): Accordingly, Pir Sefa hazretleri and Yuşa prophet is lying at the same place. Mausoleum of Pir Sefa is five stages below surface. According to the rumors; Pir Sefa, become the mausoleum protector of Hz. Yuşa, and buried here when he deceased. According to another rumor, Pir Sefa is from Medine and from ensar. During the conquer of Gaziantep by Muslims, he had come here under the commandership of Hz. Ali, and while fighting with Karaçomak side by side, his body is divided into two and become martyr. Then he is buried beside Hz. Ömer Yuşa, and told that "I made him neighbor to his Prophet Zişan ".

Ökkeşiye Hazretleri Mausoleum (Nurdağı): Mausoleum, which is on a hill at south east of Nurdağı province, is 17 kilometers away from Gözlühöyük. It is told that Ökkeşiye hazretleri was one of the five martyrs, who died during the conquer of Gaziantep and environs during Hz. Ömer period.

Rumkale (Yavuzeli): The Greek castle, which is in the Kasaba village of Yavuzeli province of city of Gaziantep, is at the intersection point of Fırat River and Merzimen stream. It is thought that it is constructed in 840 B. C. during late Hittite period. It is told that one of the 12 disciples of Jesus Christ, Johannes (Yuhenna) had turned the Greek Castle into a center during Roman period, and maintained the spread of Christianity to Gaziantep environment. Rumour has it that the draft of the Bible of Yuhenna was kept in a secret room engraved to rock in the castle and then smuggled to Beirut.It is also told that cemetery of Yuhenna is within the castle and for this reason it is a holy place.