Tourist walking up the rocky trail of the ancient city of Perperikon, while holding on the rock wall of this historical landmark located in the province of Kardzhali in Bulgaria

perperikon ancient thracian city kardzhali province bulgaria eastern rhodopes sacred place ruins ancient city hills mountains fortress historical megalith perperakion thrace settlement shrine medieval masonry cultural ancient civilization altarpiece temple bulgarian history architecture rock sanctuary residential palace complex ancient buildings tombs rock city rhodope mountain clifftop archaeological complex tourists tourism destination attractions rock structures gorna krepost thracian sanctuary medieval fortress countryside historic sites landmarks archaeological site trees rocks walking