Ertugrul Ghazi Mausoleum, the father of Osman Ghazi, the Ottoman Empire's founder. Although the exact construction date of the mausoleum is unknown, it is believed to be built toward the late 13th century. Ertugrul Gazi Museum located in Sogut district where the Ottoman Empire was founded, is actually a new structure, founded in the beginning of the 20th century. Works of the Roman, Byzantine, and Ottoman periods are exhibited. Kaymakam Fountain a reflection of beautiful 19th century architecture.