Documentary essays based on archival materials, telling about the fortifications of old Koenigsberg, the history of Koenigsberg strongholds, bastions, towers and forts. About their cultural significance and assault in 1945. A.P. Ovsyanov's new book - "In the Casemates of the Royal Fort" - is interesting primarily because it is the first publication in which the history of the former military structures of Königsberg - towers, bastions, forts - is so deeply revealed. Now they have become monuments of history and architecture, engineering and building art. They also have a special role - to be version objects, where the search for lost cultural property has been carried out for more than half a century, as well as "extras" when filming feature films.