Heybeliada Seminary, founded in 1844, was a key center for Greek Orthodox clergy training under the Ecumenical Patriarchate of Constantinople. Perched atop Ümit Hill, it offers breathtaking Marmara Sea views and a tranquil atmosphere. Closed in 1971 due to legal changes, its historic library, lecture halls, and courtyards remain well-preserved. Today, it stands as a symbol of religious education and Byzantine heritage, drawing visitors interested in theology and history.