The Karnak complex is a vast open-air museum, and the second largest ancient religious site in the world, after the Angkor Wat Temple of Cambodia. It is believed to be the second most visited historical site in Egypt; only the Giza Pyramids near Cairo receive more visits. It consists of four main parts, of which only the largest is currently open to the general public.

The term Karnak often is understood as being the Precinct of Amun-Ra only, because this is the only part most visitors see. The three other parts, the Precinct of Mut, the Precinct of Montu, and the dismantled Temple of Amenhotep IV, are closed to the public. There also are a few smaller temples and sanctuaries connecting the Precinct of Mut, the Precinct of Amun-Re, and the Luxor Temple.