 Adjacent churches to the Monastery of St. Simon the Tanner include the St. Bola's Church, St. Marks Church, and St. Simon the Tanner's Hall.The cave churches of Mokattam are also a point of interest for many tourists visiting Cairo.Many sources state that the Zabbaleen have created one of the most efficient recycling systems in the world, which recycles up to 80 percent of all the waste that they collect.