 Complete the following phrase:  The military museum and culture center was renovated and reopened at its present building in 1993 with a very successful and contemporary exhibition concept. Today in 22 rooms about nine thousand pieces from the Ottoman era through World War I are exhibited, out of a total collection of fifty thousand objects. It holds striking historical treasures such as the chain that the Byzantines stretched across the mouth of the Golden Horn to keep out the Sultans navy in 1453 during the 