The Heydar Mosque is a distinctive architectural masterpiece of Baku, and it is one of the most important tourist attractions that attract visitors and tourists from all over the world. The mosque was distinguished by a huge architectural design consisting of four minarets with a height of 95 meters. The height of the large and small mosque domes is 55 and 33 meters, respectively. This mosque is the largest building of religious worship, not only in Azerbaijan, but also in the entire South Caucasus, surpassing the impressive Akhmad Kadyrov Mosque in Grozny, with an area of 12,000 square meters, and featuring prayer and worship halls, rooms for memorizing the Holy Quran and spacious outdoor courtyards for religious ceremonies .