Kocaeli is a province in the Marmara region of Turkey, located close to Istanbul. Here are some of the top places to see in Kocaeli: Gebze Castle: This historical castle is located in Gebze, and it dates back to the Byzantine period. The castle has a stunning view of the surrounding area and is a great place to learn about the history of the region. Kartepe Ski Center: Kocaeli's Kartepe Ski Center is one of the most popular ski resorts in Turkey, with a variety of slopes for skiers of all levels. Darica Zoo: The Darica Zoo is a great place to see a wide variety of animals from around the world, including lions, tigers, giraffes, and more. Gulf of Izmit: The Gulf of Izmit is a beautiful natural attraction in Kocaeli, with stunning views of the sea and surrounding hills. Kocaeli Museum: This museum is located in the city of Izmit and houses a collection of artifacts and exhibits related to the history of Kocaeli. Seka Paper Museum: This museum is located in the city of Izmit and is dedicated to the history of papermaking in Turkey. Visitors can learn about the process of making paper and see examples of different types of paper. Eskihisar Castle: This historical castle is located in the district of Gebze and dates back to the Roman period. It is a great place to learn about the history of the region and to take in the stunning views of the surrounding area. Note: These are just a few suggestions, and there are many other places to see in Kocaeli. It's always a good idea to ask locals for their recommendations as well.