Yedikule Dungeons is one of the oldest open-air museums.

Also known as Fortress of The Seven Towers Museum, here was where the ambassadors of foreign powers that had displeased the Ottoman sultan awaited their fate (often in privation), and where at least one Ottoman prince awaited—and met—his death.

Located in the land walls near the Sea of Marmara shore, The Golden Gate was the monumental and ceremonial entrance to the city as one came along the Roman road from Europe, with four massive towers built into Theodosius II's mighty land walls.