If you visit Gebze, there are many historical and cultural spots you should see
A beautiful old castle next to the sea. It has fantastic views, especially during sunset.
The home of a very famous 19th-century Turkish painter and archaeologist. You can see his art and personal items here.
A large and historical mosque complex built by Mimar Sinan in 1523.
A great place near Gebze for hiking and climbing.
Try fresh fish in the seaside village of Eskihisar, and enjoy traditional Turkish tea by the coast.