The largest of the Egyptian pharaohs’ temples, the sun temple of Heliopolis, lies at the heart of pulsating everyday life in the megacity Cairo. Its survival is under threat from informal construction, rising groundwater levels and emerging rubbish dumps. The open-air museum devoted to the archaeological site Heliopolis with its temples, houses and graves, the result of an initiative by the Egyptian Ministry of Antiquities, is something of an island in the middle of Matariya district. With funding from the Cultural Preservation Programme of the Federal Foreign Office, a protective roof is to be erected over the museum so that the most recently found, environmentally sensitive treasures of Ancient Egyptian art can be presented to the local population and visitors.