Navigating through dense thickets of bushes and trees in the village of Zaklyuchye in the Tver region, one can reach a place of stunning beauty, where either a medieval castle built by knights or a set for horror films rises. In reality, these are abandoned structures, the summer residence of St. Petersburg architect Alexander Sergeyevich Khrenov, one of the main architects of St. Isaac's Cathedral.

The architect designed his dacha himself, aiming to create an "estate" unlike any other. In the main building, he decided to combine several styles. Inspiration came from medieval knightly castles of Europe with their Gothic windows, massive architecture, towers, and balconies adorned with wrought iron railings. According to some reports, a tall spire once crowned the residence with a weather vane in the shape of a rooster. The interior of the house was also strikingly beautiful: paintings hung on the walls, a piano stood, crystal glasses were in the cabinets, and spiral staircases led upstairs. The residence was the main dominant of the "estate," but the architectural ensemble was complemented by other buildings.

The hunting lodge was originally built opposite the pond. A small observation platform with a low parapet made of boulders has survived above the steep bank. In the early 20th century, Khrenov, being a great horse enthusiast, built a stable here for breeding trotting breeds. The life of the estate ended predictably: it was nationalized in 1918. However, the residence was maintained, hosting a pioneer camp. Several original monuments were installed, such as a girl with a paddle and young athletes. But in the 1990s, all of this was looted, even stones and wooden frames were pried off. Attempts to restore the dacha were unsuccessful.