Azerbaijan Builder Day
Azerbaijan Builder Day is held on April 10. This event in the first decade of the month April is annual. 
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The first known fireplace and construction in human history, which is dated back from 700,000 to 500,000 years ago, was discovered in Azikh Cave, the largest cave in Azerbaijan. Baku, the capital of Azerbaijan, went on an impressive building spree after its first oil boom that started in the 1870s. Oily Rocks (Neft Dashlar) is the first and largest town on stilts to be constructed at sea. Situated in the Caspian Sea, the town was built in phases after 1947.
Similar holidays and events, festivals and interesting facts
Night of Destiny on April 6
Hidirellez on May 6 (Turkey, Azerbaijan, is also celebrated in other Turkic-speaking countries as the day on which the prophets Khidr [al-Khidr] and Ilyas [Ilya] met on earth);
Flower Festival in Azerbaijan on May 10
Day of employees of the Ministry of Ecology and Natural Resources in Azerbaijan on May 23 (and the celebration of the Annunciation of the Bab);
TDFR Republic Day in Azerbaijan and Armenia on May 28 (celebrates the declaration of independence of the First Republic of Armenia and the Azerbaijan Democratic Republic from the Transcaucasian Democratic Federative Republic in 1918);
Civil Aviation Day in Azerbaijan on June 2
Melioration Day in Azerbaijan on June 5 (Reclamation Day)