Yedikule Dungeons: A time capsule of Istanbul
Istanbul is one of the cities that have buildings like perfect time capsules inside. One of them is Yedikule Dungeons because many well known sultans were imprisoned here.
Actually it was built in Byzantine period but it was extended in Ottoman era. Sultans were taken here when any uprising existed. Towers were built for various purposes.
It is one of the worth visiting places of Istanbul city to feel the history.