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The Korutepe Tunnel (Turkish: Korutepe Tüneli), is a motorway tunnel constructed on the Istanbul–Ankara motorway O-4 E80 in Kocaeli Province, northwestern Turkey. It is situated on the Korutepe Hill west of İzmit. The 1,028–1,088-metre (3,373–3,570 ft) long twin-tube tunnel carries two lanes of traffic in each direction. The Gültepe Tunnel follows it in the west direction. The tunnel was constructed in the 1980s. During the 1999 İzmit earthquake, the tunnel was light damaged. In 2012, the tunnel's both tubes were reinforced. In the time period of 2013–2014, the tunnel was modernized for traffic safety. Around 55,000 vehicles pass through the tunnel in both directions daily.

The 1999 İzmit earthquake (also known as the 17 August Earthquake or the 1999 Gölcük Earthquake) was a magnitude 7.6 earthquake which the Kocaeli Province of Turkey on 17 August 1999. Between 17,127 and 18,373 people died as a result, and it caused an estimated US $6.5 billion in damage. It was named for the quake's proximity to the northwestern city of İzmit. The earthquake occurred at 03:01 local time (00:01 UTC) at a shallow depth of 15 km. A maximum Mercalli intensity of X (Extreme) was observed. The earthquake lasted for 37 seconds, causing seismic damage, and is widely remembered as one of the deadliest natural disasters in modern Turkish history. The 1999 earthquake was part of a seismic sequence along the North Anatolian Fault that started in 1939, causing large earthquakes that moved progressively from east to west over a period of 60 years. The earthquake encouraged the establishment of a so-called earthquake tax aimed at providing assistance to those affected by the earthquake.

Kocaeli Bayan Futbol Kulübü, shortly Kocaeli Bayan FK, is a Turkish sole women's football sports club, based in İzmit city of Kocaeli. It was founded by Hasan Alemdaroğlu in 2016. Currently, they play in the Turkish Women's Second Football League. The club colors are green and black.The team finished the 2018–19 Women's Second League as runners-up, and was promoted to the Turkish Women's First Football League.

The Gültepe Tunnel (Turkish: Gültepe Tüneli), is a motorway tunnel constructed on the Istanbul–Ankara motorway O-4 E80 in Kocaeli Province, northwestern Turkey. It was opened to traffic in 1984. It is situated on the Gültepe Hill west of İzmit. The 639–584-metre (2,096–1,916 ft) long twin-tube tunnel carries two lanes of traffic in each direction. The tunnel was constructed in the 1980s. During the 1999 İzmit earthquake, the tunnel was light damaged. In 2012, the tunnel's both tubes were reinforced. In the time period of 2013–2014, the tunnel was modernized for traffic safety. Around 55,000 vehicles pass through the tunnel in both directions daily.

Kocaeli Museum, a.k.a. Kocaeli Archaeology and Ethnography Museum or İzmit Museum, Turkish: Kocaeli Müzesi) is a national museum in Kocaeli (İzmit), northwestern Turkey, exhibiting archaeological artifacts and ethnographic objects. It is housed in the former railway station of İzmit.The museum is situated on İstasyon St. in Kozlu neighborhood of İzmit.The railway station was designed by German architect Otto Ritter, and built between 1873 and 1910. The facility covers an area of 21 daa (5.2 acres). The railway station became defunct after the course of the railway, which ran along the coast of Marmara Sea and passed through the city center, was changed to run north of the city. After restoration works for redevelopment, which began in 2004, the former railway station was opened early 2007. The museum consists of 1,965 archaeological, 1,549 ethnographic objects and 5,155 coins. In addition to the exhibition halls, there is a 130-seated conference room and a laboratory. The museum objects are partly exhibited in the museum halls and partly open-air in the museum yard. A steam locomotive and two railroad cars, redesigned as cafeteria and restaurant and situated in front of the museum, serve the visitors.In the museum halls, artifacts from Paleolithic, Hellenic, Roman, Byzantine and Ottoman era are exhibited.

İzmit İsmetpaşa Stadium (Turkish: İzmit İsmetpaşa Stadyumu) was a multi-purpose stadium in the Derince district of İzmit in Kocaeli Province, Turkey. It was named after the Turkish general and statesman İsmet İnönü (1884–1973), widely known as İsmet Pasha. Built in 1972, it was situated on the Istanbul-İzmit highway D.100. The stadium held 15,462 spectators, and was primarily used for football matches as the home stadium of Kocaelispor.

USS Gudgeon (SS/AGSS/SSAG-567), a Tang-class submarine, was the second ship of the United States Navy to be named for the gudgeon, a species of small fresh-water minnow.

USS Eversole (DD-789) was a Gearing-class destroyer of the United States Navy, the second Navy ship named for Lieutenant (junior grade) John T. Eversole (1915–1942), a naval aviator who was killed in the Battle of Midway. She later served in the Turkish navy from 1973 to 1995 as TCG Gayret (D-352) and is now a ship museum. Eversole was launched on 8 January 1946 at the Tacoma Washington shipyard of Todd-Pacific Shipyards, Inc., Seattle, Washington; sponsored by Mrs. S. R. Eversole, mother of Lt. (j.g.) Eversole; and commissioned on 10 May 1946. The Eversole was one of the final three ships built in Tacoma by Todd-Pacific before closure of the Tacoma yard.

After its foundation by Osman I in about 1299, the Ottoman Empire expanded across Bithynia in north-west Anatolia by capturing territory from the Byzantine Empire. Osman was succeeded by his son Orhan in about 1324 and, following long sieges, he took the important cities of Bursa (1326) and Nicaea (1331). Next, Orhan besieged Nicomedia from 1333 to 1337. The Byzantine garrison surrendered due to lack of food and resources. Orhan's victory sealed Ottoman control of Bithynia.

The Battle of Bapheus occurred on 27 July 1302, between an Ottoman army under Osman I and a Byzantine army under George Mouzalon. The battle ended in a crucial Ottoman victory, cementing the Ottoman state and heralding the final capture of Byzantine Bithynia by the Ottomans.

Nicomedia (; Greek: Νικομήδεια, Nikomedeia; modern İzmit) was an ancient Greek city located in what is now Turkey. In 286, Nicomedia became the eastern and most senior capital city of the Roman Empire (chosen by the emperor Diocletian who ruled in the east), a status which the city maintained during the Tetrarchy system (293–324). The Tetrarchy ended with the Battle of Chrysopolis (Üsküdar) in 324, when Constantine defeated Licinius and became the sole emperor. In 330 Constantine chose for himself the nearby Byzantium (which was renamed Constantinople, modern Istanbul) as the new capital of the Roman Empire. The city was incorporated into the Ottoman Empire with the victory of Sultan Orhan Gazi against the Byzantine Empire. The Byzantines managed to retake it in the aftermath of the Battle of Ankara, but it fell definitively to the Ottomans in 1419.

The İzmit Clock Tower (Turkish: İzmit Saat Kulesi) in İzmit, Turkey is one of many clock towers that were built throughout the Ottoman Empire as a result of the decree which was sent to the provincial governors to commemorate the 25th anniversary of Sultan Abdülhamid II's ascension to the Ottoman throne. It was designed by architect Vedat Tek upon the order of Musa Kazım Bey, the governor of İzmit, and built in 1902. Other sources name the architect of the tower as Mihran Azaryan who was an Armenian-Ottoman of Izmit origin.The neoclassical clock tower, which stands just in front of the Hünkar Pavilion of Sultan Abdülaziz, has four floors with dimensions 3.65 m × 3.65 m (12.0 ft × 12.0 ft). The ground floor houses fountains, while the clock is on the top floor. All four facades of the middle floors are decorated with the seal of Sultan Abdülhamid II. The pointed cone on top is coated with lead. The clock tower has been an inseparable part of the history of İzmit throughout the 20th century, and has become the symbol of the city. In the former Balkan provinces of the Ottoman Empire, particularly in present-day Serbian, Bosnian and Montenegrin towns such as Belgrade, Prijepolje, Sarajevo, Banja Luka, Gradačac and Stara Varoš, similar Ottoman era clock towers are still named Sahat Kula (deriving from the Turkish words Saat Kulesi, meaning Clock Tower.) It was restored in 2006.