Meknes and Volubilis are the closest stack of two UNESCO World Heritage sites to Fes — and the pair pack about two thousand years of Moroccan imperial history into a single long day. Meknes is the underrated imperial city: smaller, calmer and more walkable than Fes itself, anchored by the 17th-century monumental gates Moulay Ismail built when he tried to make it the capital of his empire. Thirty kilometres further north sits Volubilis, the best-preserved Roman city in Morocco, with in-situ mosaics and the legible footprint of a complete provincial capital.

From Rabat the easiest route is the 90-minute train to Meknes Amir Abdelkader station, from which the medina, Bab Mansour, the Heri es-Souani granaries and Moulay Ismail's mausoleum are all inside about 1.5 km on foot. Volubilis isn't reachable by train; the standard add-on is a day-hire grand taxi from Meknes for around 400–500 MAD, which usually also covers the nearby holy town of Moulay Idriss Zerhoun on the same loop.

The Roman site is open and sprawling, with the decumanus, basilica, capitol, triumphal arch and several mosaic houses spread across an exposed plateau. A licensed guide at the entrance (200–300 MAD for two hours, in English or French) is strongly recommended — most of the layout is unmarked, and a guide is the difference between a forty-minute walk and a properly legible visit. Return the same route in the late afternoon; the day works as a single direction-of-travel trip, not a triangle that tries to add Fes.