 Enka's earliest projects include the İstinye Highway Bridge and the Babaeski-Kuleli road construction in Istanbul.In the early 1970s, Enka, in a partnership with German company Wayss and Freytag, built the Ortaköy viaducts and the Bosphorus Bridge.Enka continued to expand internationally in the 1980s with the award of the 1981 housing development contract in Al Medinah, Saudi Arabia, in a joint venture with the company Kutlutas.