CLUES
- This city, on the southern edge of the Sahara, is known as the gateway to the desert.
- The historic city center, an important crossroads of the caravan trade, is divided into 11 sections with irregular shapes.
- Among the earthen dwellings and religious buildings is a 27-meter mud-brick minaret, the tallest such structure in the world.
- The location dates to the 15th and 16th centuries, when the Sultanate of Aïr established itself there.
ANSWER The Historic Center of Agadez, Niger