Overhead drone shot of a water reservoir situated in the middle of the complex of the historical landmark of Perperikon, in the province of Kardzhali in Bulgaria

water reservoir 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 woodlands ramps