The paper is part of a research series for ancient Roman sites in Northern Bulgaria which aim to present the possibilities of creating a specialized form of cultural and historical product that ensures sustainable utilization of the Bulgarian tangible heritage. A study of the Roman fortress Sostra, located on the Via Traiani road as a cultural and historical tourist resource was conducted. The castellum is characterized as an object of cultural heritage in the region of Troyan Municipality in Bulgaria. The methodology applied in assessing the potential of the Ancient Roman fortress Sostra is primarily designed for historical and cultural sites. An evaluation was made under the following criteria: potential for development, degree of impact / interaction, degree of modification with relevant indicators. Also an expedition-field method for terrain research was applied. Summaries and conclusions were made in order to highlight the possibility of forming a tourist product of cultural and cognitive tourism.