The theme of preserving national culture is associated with the work of the famous architect and art historian Ivan Ivanovich Gornostaev (1821–1874), who popularized Russian culture and its unique originality. The article examines the activities of I. I. Gornostaev as the architect of the Imperial Public Library (his main works are a special room for storing incunabula («Faust’s Cabinet») and the New Reading Room (together with the architect V. I. Sobolshchikov)), as well as Saint-Petersburg University (according to his designs, a building was built for a botanical laboratory with a greenhouse, and the building was rebuilt «for playing ball» to accommodate a library, a physics study and an observatory there). He is the author of two projects – the Iversky Cathedral of the NikoloBabaevsky Monastery and the Kazan Cathedral of the Transfiguration Ust Medveditsky Monastery. Reflected his achievements in teaching as the author of the first systematic course in the history of fine arts in Russia. The role of I. I. Gornostaev in the study of the history of art of the Ancient World, the Middle Ages and the Renaissance is shown.