The manuscript “Description of the city of Moscow” from the Voltaire Library has been subjected to special study for the first time. In this essay, the ancient Russian capital is presented as a vast and crowded city, the distinctive feature of which is the abundance of churches and monasteries. The description of the city is conducted according to the historically formed parts: the Kremlin, Kitay-gorod, White City, Earthen City. The description is based on the “Plan of the Imperial city of Moscow” by I. Michurin (1739). The most likely the author of this kind of guidebooks is I. C.