Guardian: The caretaker stares at the wrought iron door and its four ancient locks with a gleam in his eyes. Outside, the Moroccan sun shines down upon the ornate coloured tiles of Khizanat al-Qarawiyyin, located in the old medina of Fez. This, it is widely believed, is the oldest library in the world – and soon it will be open to the general public again.

“It was like healing wounds,” says Aziza Chaouni, a Fez native and the architect tasked with restoring the great library.

The iron door is found along a corridor that once linked the library with the neighbouring Qarawiyyin Mosque – the two centres of learning and cultural life in old Fez. Inside it were kept the most prized tomes in the collection; works of such immense import that each of the four locks had separate keys held with four different individuals, all of whom had to be present for the door to be opened.

The restored library boasts a new sewerage and underground canal system to drain away the moisture that had threatened to destroy many of its prized manuscripts – plus an elaborate lab to treat, preserve and digitise the oldest texts. The collection of advanced machinery includes digital scanners that identify minuscule holes in the ancient paper rolls, and a preservative machine which treats the manuscripts with a liquid that moistens them enough to prevent cracking.

A special room with strict security and temperature and humidity controls houses the most ancient works. The most precious is a ninth-century copy of the Qur’an, written in ornate Kufic script on camel skin.

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