Hisarlaka Fortress, Ancient fortress near Kyustendil, Bulgaria.
The fortress forms an irregular polygon measuring 175 meters in length and 117 meters in width, protected by walls reaching 10 meters in height.
Built by Romans around 400 AD, the fortress underwent significant modifications during the 6th century and served as a military stronghold until Ottoman forces destroyed it.
The fortress walls display Roman engineering techniques known as opus mixtum, combining stone and brick construction with specialized powdered brick mortar for enhanced durability.
Located 2 kilometers southeast of Kyustendil, visitors can access the fortress through local roads connecting it to the city center and surrounding municipalities.
The fortress structure incorporates fourteen towers of varying shapes reaching 12 meters in height and features two main gates plus five concealed entrances.
Location: Kyustendil
GPS coordinates: 42.27570,22.69180
Latest update: May 17, 2025 10:27
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