It has been built by Gazi Suleyman Pasa (the son of the second sultan of the Ottomman Empire-Orhan Gazi) between 1331-1335. It has only one minaret. It's been restorated in 1948 and 1960. It also has a well-lighted and airy inside.
It was built in 14 century as a part of Gazi Suleyman Pasa Mosque. It's still in use for both women and man.
This tower is build in 1923 on the honor of the Sakarya Victory by the governor of the town. It has 3 floors. Unfortunately it's not possible to enter the tower. It's located on a high hill which has a wonderful view over the city.
What to buy:
You can buy "Ugut". It's a marmelade which made of wheat essence. It has own sugar, no added extra sugar. They're sold in different shape of bottles.
You can also buy some handcraft such as table cover, towel, curtain etc. I bought a magnet which has the victory tower shape:))
What to pay: It's quite cheap. I paid 5 TL (2,5 EUR) for the magnet. And 4-12 TL for different size of Ugut marmelade.
It's an about 10 km.s north of the city center. Unfortunately it's not possible to go there in public transport but you can hire a taxi. It's very small lake with some pretty windmills which are constructed for a TV serial. You can take a walk around the lake. There is a small village which is called "Golbasi Village". It has a nice old mosque with wooden minaret.
There is also a cafe by the lake that you can have a rest after taking a walk around the lake.
Goynuk has a wonderful landscape that you can walk, hike, bike, raft etc. I've been in Sunnet Lake & Cubuk Lake. Both are very peaceful place.