Karnak stands on the east bank of the Nile at ancient Thebes, now Luxor. Evidence for activity at the site reaches back to the Eleventh Dynasty, before the great New Kingdom halls were built. Senusret I's White Chapel is a celebrated Middle Kingdom survival, reconstructed from blocks reused in later building work. The complex developed through successive royal projects rather than a single unchanged plan. Its principal temple follows an east-west axis, while another major route extends south towards Luxor Temple. Courts, gateways, shrines and enclosure walls can therefore be read as the remains of many decisions, not as a simple procession from the newest king to the oldest.

The Great Hypostyle Hall is Karnak's most striking forest of stone. Its sandstone columns take the forms of papyrus plants, with twelve taller columns along the central aisle rising above the lower ones on either side. Seti I and Ramesses II were the principal rulers responsible for the hall's decoration. The raised central section allowed light through clerestory openings, while the roof itself used enormous stone beams and slabs rather than cedar. Walls and columns carried images and inscriptions presenting the king before the gods. Their scale was intended to impress, but their purpose was also religious: architecture and decoration created a setting in which royal offerings helped maintain divine order.

Obelisks gave that sacred landscape a different kind of vertical emphasis. Hatshepsut's standing granite obelisk remains one of Karnak's best-known monuments, its inscriptions proclaiming the king's dedication to Amun. The monolith belongs to a programme of royal building, not to an isolated contest to raise the tallest object in history. Other features served the practical requirements of worship. The sacred lake formed part of the ritual landscape, while chapels sheltered divine barques and courts provided space for ceremonies. Reused blocks reveal an important habit of Egyptian builders: a monument could be dismantled and incorporated into another king's work, preserving an earlier name beneath a later structure.

The wealth of Amun's institutions joined religion with administration. Land, produce, offerings and royal gifts supported the people and activities of the temples. Priests performed the cult, while scribes, workers and other dependants sustained the wider institution. During the Opet festival, the cult images of Amun, Mut and Khonsu travelled from Karnak to Luxor Temple. Their sacred barques could be carried in procession or transported aboard larger river vessels; a boat carried along a road was not literally sailing down it. The festival renewed the relationship between the gods and kingship. The processional landscape included different forms of sphinx, so its statues should not all be described as ram-headed.

Karnak was larger than the main sanctuary of Amun. The precinct of Mut lay to the south and the precinct of Montu to the north, with numerous other shrines within the wider sacred landscape. Sekhmet statues associated with Amenhotep III belong to this broader religious world, but Sekhmet and Mut should not simply be treated as the same goddess. Akhenaten's religious changes also left their mark: attacks on Amun's names and later restoration work survive alongside the remains of the king's own Aten monuments. The stones record conflict and changing priorities as well as devotion. A later generation could honour a god by restoring an inscription that an earlier ruler had ordered removed.

Building continued under rulers after the New Kingdom, including the Ptolemies and Roman emperors. In later antiquity, the old cults declined and parts of the complex acquired new uses, including Christian occupation. These layers do not demonstrate that the original temple worship continued without interruption. Modern excavation and conservation have recovered buildings, reassembled monuments and studied inscriptions that had been buried, reused or damaged. Karnak is consequently both an ancient religious site and an archaeological record of change. Its grandeur comes from the visible accumulation of human labour and royal ambition, with one generation's offering becoming part of the next generation's sacred inheritance.