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A very simple small mosque, built some time in the 13th century under Ertuğrul Gazi. It's thus claimed as the Ottomans' first permanent building; it's been much restored since. Within its precincts are the well (nowadays dry) which gave the mosque its common name. This was intended not just for religious ablution but to alleviate the settlement's chronic water shortage.
© OpenStreetMap contributors
Small display of traditional clothing and artefacts of the Yörük people of this region, and other curios. The building is from 1900, a former dispensary. Exhibit displays are only in Turkish.
Ertuğrul Gazi türbesi
A humble mausoleum for the birthplace of a dynasty ― Osman I built the original, but it was extensively rebuilt in the 19th century. Like the rest of town, it was shot up in the Greek invasion of 1921, but restored as before. It's an octagonal domed stone building, with the interior decorated in Ottoman Baroque style and by Kayı and modern Turkic flags. In the leafy cemetery are other graves of early Ottoman or Kayı notables. You may encounter visitors got up in Kayı warrior costume, owing less to history than to a Turkish TV soap opera: Kuruluş: Osman is the third in that series, aired from 2019.
This is the hilltop mausoleum of Dursun Fakıh, a 13th century scholar, judge and preacher who became brother-in-law to Osman I. Since his pronouncements boosted all things Ottoman, he's been sanctified as legitimising the dynasty. He died in 1327.