Piatykhatky (Ukrainian: П'ятихатки; Russian: Пятихатки English: Fivehouses) is a neighborhood of Kharkiv, Ukraine, former khutir. The neighborhood is part of the Kiev Raion of Kharkiv city. In the 50's it became part Kharkiv City. With construction of the Kharkiv Institute of Physics and Technology "New Matter", Piatyhatky became incorporated into the city.
The Burial site was located in a forest reserve about 5 km from the outskirts of Kharkiv (currently within the city limits). In the late 1930s it was a remote and sparsely populated area. According to local residents, the site was secured and surrounded by a fence at that time. After World War II the site was abandoned. In the late 1950s – early 1960s, a nuclear research facility of Kharkiv Institute of Physics and Technology (Харківський фізико-технічний інститут) and а residential area were built about 1 km from burial site. As a result of the influx of new residents into this previously sparsely populated area, the burial site was discovered by children playing in the woods exploring the surrounding area. Children would find on the surface and in shallow graves bones, skulls, pieces of uniform (buttons, insignias, etc.) of Polish and Soviet Armies and bring them home and to school. It was common knowledge among local residents that it was burial site of Polish officers executed in 1940, although authorities denied any knowledge of this. Later a recreational area for KGB employees was built on the site. Authorities continued to deny any knowledge of this burial site until the early 1990s, when the government of the newly independent Ukraine admitted it was the burial site of Polish officers as well as Soviet citizens executed by Stalin's regime in the 1930s.
A memorial complex (50°04′50″N 36°15′45″E / 50.08056°N 36.26250°E) was built in memory of the Ukrainian intellectuals murdered by the Soviet secret police (the NKVD) in 1937-38, and also several thousand Polish officers in 1940, murdered as part of the Katyn massacre.