Nestled in the heart of Mokattam Mountain in Cairo, The Cave Church, also known as St. Simon Monastery, is a massive church carved into the rocks. Built by the Zabbaleen community, who are garbage collectors and recyclers, this impressive church can accommodate up to 20,000 people and features stunning paintings and sculptures. Despite its non-touristy location, The Cave Church is a must-see attraction in Cairo that will leave you in awe.