Gulustan Fortress - Credit: Wikimedia Commons
Gulustan Fortress or Castle () is a medieval castle dating back to the 9th-12th centuries located in Shamakhi District of Azerbaijan. Although the oldest archeological findings from the castle date back to the 9th century, the Gulustan castle was radically rebuilt and strengthened in the 12th century - the beginning of the 13th century. Read more on Wikipedia
Source: en.wikipedia.org