Tomb of Orhan Gazi
This building, which houses the tomb of the Ottoman Sultan Orhan Gazi (1281-1362), who conquered Bursa in 1326, was built on the site of the church in the Saint Elias (Hagia Elia) Monastery, which is known to have existed in this area in the 11th century. Mosaics from the Byzantine Period, traces of which can still be seen on the floor of the tomb today, prove the existence of the church. The building, which was completely destroyed in the 1855 earthquake, was rebuilt by Sultan Abdülaziz in 1863.

Orhan Gazi Tomb has a square plan. The building is covered with a small dome resting on four columns. Inside the tomb, the dome, pendants and window pediments are decorated with Turkish Baroque hand-drawn ornaments in accordance with the decoration style of the 19th century. Column headings also reflect the art style of the same period. Curtains made of Hereke fabric give the interior a palace atmosphere.

There are twenty sarcophagi in the tomb. Orhan Gazi's sarcophagus is located in the middle of the tomb. Also in the tomb are Orhan Gazi's wife Nilüfer Hatun, Orhan Gazi's son Şehzade Kasım, Yıldırım Bayezid's daughter Fatma Sultan, Cem Sultan's son Abdullah and II. There are sarcophagi belonging to Prince Korkut, son of Bayezid. It is not known who the other sarcophagi belong to.    

The tomb was repaired in 1801, 1863 and 2009.