Alaeddin Mosque The Alaeddin Mosque in Odunpazarı, located in Eskişehir, Turkey, is a historic mosque that serves as a popular tourist destination. Built in 1267 during the reign of Seljuk Sultan of Gıyaseddin Keyhüsrev III, it was donated by either Cacaoğlu Cibril or Nureddin, both followers of Mevlana. Constructed using rubble masonry, the mosque has an almost-quadratic rectangular plan with a central octagonal dome measuring 6.50m (21.3ft) in diameter and a flat wooden roof. The entrance, located on the north side, leads to the women's section of the mosque, where ornate Quranic verses are inscribed around the perimeter of the ceiling. The southern niche of the mosque houses the mihrab, which exhibits late Ottoman architectural style. Large, rectangular windows provide ample lighting, while the north and lateral facades feature a two-story window layout that creates an interesting design at both ends of the building. After several repairs, the mosque lost all of its original properties. In 1945, it was closed to worship by executive decree and converted into an archaeological museum until the establishment of the Eskişehir Eti Archaeology Museum. In 2014, the mosque underwent a restoration that partially restored some of its original properties.