Heri es-Souani

Moulay Ismail kept a standing army of 150,000 soldiers. That number required a logistics operation that rivalled any European power of the 17th century, and this building was its engine. The Heri es-Souani — the name means roughly "the royal granaries" — stored grain, olives, and fodder enough to feed Ismail's troops and the 12,000 horses in his cavalry for months.

The scale makes sense only when you understand that Ismail ruled for 55 years (1672–1727) and spent most of them either at war or preparing for it. He needed supply lines that did not depend on seasonal harvests or fragile trade routes. The granaries were his insurance policy.

The complex originally extended much further than what survives. The 1755 earthquake — the same one that destroyed Lisbon — collapsed large sections. What remains is still enormous: rows of vaulted chambers stretching into the distance, the thick walls keeping the interior cool even in Meknes summers. The engineering was simple and effective. Walls over a metre thick for insulation. Channels in the floor connected to a system of underground waterways fed by a nearby lake, creating a kind of passive air conditioning centuries before the concept had a name.

The granaries are one of the least-crowded major monuments in Morocco. Tour buses go to Bab Mansour and the mausoleum. The Heri es-Souani gets the independent travellers and the people who read beyond the first paragraph.

The open-roofed sections are the most photogenic — the combination of ancient walls, collapsed vaults, and trees growing through the ruins has a quality that Meknes's other monuments lack. It feels like discovering something rather than being shown something.

From the granaries, walk behind the complex to the Bassin de l'Agdal. The lake puts the whole operation in perspective. Then walk 10 minutes north to the Moulay Ismail Mausoleum and Bab Mansour. Together, the three sites take a half-day and give you the full picture of what Ismail was building.