refurbished roman fortress built at the end of the 4th to the beginning of the 5th century.

4th 5th aerial against also among and architecture background beautiful beauty beginning blue bright building built bulgaria bulgarian century city cityscape cloud color colorful destination end environment europe european foot fortress from hill hissarluka home kyustendil landscape mountain natural nature near nobody old osogovo outdoor outdoors over park place red refurbished roman scene scenery scenic sea sky small spring summer that tourism tourist town travel urban view wall white