Turkey travel guide
Explore Kocaeli, a convenient escape near Istanbul offering Marmara and Black Sea coastlines, Kartepe’s mountain scenery, Ballıkayalar Nature Park, museums, beaches, forests and year-round outdoor activities.
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Museums & History
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Submit a Radar report →A historic tomb in the Bağçeşme area. Its inscription names Abdullah Es-Seyyid Ese Molla Dede, connecting the site with Izmit’s Ottoman religious and Sufi heritage. Observe local visiting customs.
📍 Orhan Mahallesi, Bağçeşme mevkii, Ese Dede Türbesi, İzmit/Kocaeli
Museums & History
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Submit a Radar report →A Byzantine castle on a hill northeast of Eskihisar harbour. Its inner and outer fortifications form part of the historic defences of the Gulf of Izmit. Check current access arrangements before visiting.
📍 Eskihisar Mahallesi, kale tepesi, Gebze/Kocaeli
Museums & History
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Submit a Radar report →A historic fountain in the village square near Osman Hamdi Bey’s house. Its paired spouts and basins, arched niches and Ottoman inscription reflect Eskihisar’s water-related architectural heritage.
📍 Eskihisar Mahallesi, köy meydanı, tarihî meydan çeşmesi, Gebze/Kocaeli
Museums & History
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Submit a Radar report →A central Izmit mosque with origins in the sixteenth century. Rebuilt following earthquakes on several occasions, it was reconstructed in keeping with its earlier form after the 1999 earthquake. Respect worship arrangements.
📍 Cevdet Dengel Hoca Caddesi, Fevziye Camii, İzmit/Kocaeli
Museums & History
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Submit a Radar report →Also known as Bostan Dolabı, this historic water structure is associated with the supply system serving the Çoban Mustafa Pasha Complex and Gebze. Check current visitor access and restoration arrangements for the square building with its pyramidal roof.
📍 Gebze merkez, tarihî Su Dolabı yapısı, Gebze/Kocaeli
Museums & History
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Submit a Radar report →One of the burial grounds of ancient Nicomedia. Ancient tombs and Byzantine building remains were identified during road works. It is not a managed open-air museum; confirm access and conservation restrictions before visiting.
📍 Gültepe ve Yenidoğan çevresi, antik nekropol alanı, İzmit/Kocaeli
Museums & History
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Submit a Radar report →A memorial to the Carthaginian commander Hannibal within the TÜBİTAK Gebze campus, inaugurated in 1981. It should not be treated as proof of the exact location of his ancient grave. Confirm campus entry and visitor permission arrangements in advance.
📍 TÜBİTAK Gebze Yerleşkesi, Hannibal Anıtı, Gebze/Kocaeli
Museums & History
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Submit a Radar report →Founded in 1843, this historic factory developed through textile production for Ottoman palaces. Its silk furnishings and later carpet production make it an important part of Hereke’s industrial heritage. Confirm visitor access and restrictions around production areas in advance.
📍 Hereke, tarihî Halı ve İpekli Dokuma Fabrikası, Körfez/Kocaeli
Museums & History
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Submit a Radar report →A historic fortification in Hereke, also associated with the Ottoman conquest of the Izmit region. The restored castle reopened to visitors in 2023. Check current visiting arrangements.
📍 Hacı Akif Mahallesi, Kale Sokak, Hereke, Körfez/Kocaeli
Plan your visit
Kocaeli lies east of Istanbul between the Marmara and Black Sea coasts, offering industrial heritage, forest areas, beaches and winter activities at Kartepe.
Summer suits the coast, spring and autumn suit nature, and winter attracts visitors to Kartepe.
Rail, buses and ferries serve urban districts. A car is useful for Kartepe and the Black Sea coast.
Travel conditions and opening arrangements can change. Check current information before your visit.
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