Serapeum, Saqqara, Egypt

Beneath the sands of Saqqara, north-west of the Step Pyramid of Djoser, lies one of Egypt’s most enigmatic monuments — the Serapeum. Rediscovered in 1850 by the French Egyptologist Auguste Mariette, it is a vast underground labyrinth of corridors carved into the limestone bedrock, lined with some two dozen colossal stone ‘boxes’ set into alcoves along its galleries.

The conventional explanation is that the Serapeum was the burial place of the Apis bulls — sacred animals revered as the living manifestation of the creator god Ptah of Memphis, and later associated with Osiris. When an Apis bull died it was mummified with great ceremony and, so the account goes, laid to rest within one of these enormous granite sarcophagi. Yet this attribution carries a lasting controversy: when Mariette opened the boxes in the nineteenth century, nearly all were found empty or disturbed, and no bull remains were ever recovered from the granite boxes themselves — earlier Apis burials nearby had used far simpler wooden coffins. Whether the boxes were ever truly funerary in purpose remains an open question, and serious scholars still hold differing views.

What astonishes every visitor is the sheer scale and precision of the boxes. Each is hewn from a single block of hard stone — mostly granite, with one of diorite — and weighs in the region of 70 to 100 tons, the massive lids adding another 20 to 30 tons apiece. They are not roughly hollowed but carved with extraordinary accuracy: interior walls remarkably flat, corners squared to within astonishingly fine tolerances, surfaces polished smooth inside and out. The exactness of the work has invited comparison with modern precision engineering, and continues to fascinate engineers and Egyptologists alike.

Perhaps the greatest mystery of all is one of transport. The granite is generally held to have come from the quarries of Aswan, close to 900 kilometres to the south. How blocks of this weight were quarried, finished, carried the length of Egypt, then manoeuvred down into narrow subterranean corridors and lowered with such care into alcoves barely larger than themselves — all with the technology of more than three thousand years ago — remains a genuine puzzle. The mainstream view holds that it was achieved through manpower, sledges and lubrication, though the tight geometry of the tunnels leaves room for wonder.

Standing among these silent giants in the cool darkness, it is impossible not to feel the weight of the question they pose. Whatever their true purpose, the Serapeum stands as a testament to the ambition, skill and mystery of Ancient Egypt.