Abstract
The European cultural heritage route of residences once belonging to the Radziwiłł family, located in the territories today belonging to Latvia, Lithuania, Belarus, Ukraine, and Poland, is demarcated by ca. fifty sites exhibiting high artistic and historical values. The ongoing research contributes to determining the value of the preserved historical sites, as well as assessing the risk they face. Development of a protection method at the level of the structure of the building, but also increasing the social and ethnic integration, will contribute to the creation of collective memory and identity of Europeans. The castle in Ołyka [Ukrainian: Olyka], one of the three centres of the Radziwiłł family fee tail, is one of the most distinguished examples of residential architecture in Volhynia. It has not been scientifically documented to date, which could constitute a foundation for the development of the building restoration project. Preserved to our time in a very bad technical condition, it awaits protection of its architectural heritage.