The Shali Fortress, also known as the Al-Shali Fortress, is a historic fortress located in the city of Sana'a, Yemen. It is one of the most important landmarks in the city and a symbol of Yemen's rich history. The Shali Fortress is a massive mud-brick structure that dates back to the 12th century. It is located on a hill overlooking the old city of Sana'a. The fortress has a number of towers and gates, and it is surrounded by a moat.