Issue 21 of the "Urban Core of Medieval Pskov" publishes a study by V.L. Beletsky "The Pskov Kremlin in Plans and Images of the 17th-19th Centuries" and two thematically related applications dedicated to images of the Pskov Kremlin on icons (author N.M. Tkacheva) and materials on Pskov in the photo archive of the IIMK RAS (compiled by G.V. Dluzhnevskaya). The publication is designed for archaeologists, historians, students.