| Artist | Jean Baptiste Arnout (1788-1865) |
| Engraver | Augustin François Lemaitre (1797-1870) |
| Date | 1840 |
| Technique | Copper Engraving |
| Category | Ottoman Empire And Turkey |
| Source | Turkey Volume Of L'Univers Pittoresque, Paris |
It is a group of land walls and towers that surround Istanbul from the southwest, also known as the Seven Tower Dungeons. Four of these towers were built by the Byzantine Emperors, and three of them by the Sultan Mehmet the Conqueror. Now, it is an open air museum.