Originally built in XVI-XVII century, White bastion fortress was later upgraded by Ottoman (1730s) and Austro-Hungarian army (1878-1918). It is the strongest point within the walls of the old fortifications of Vratnik, and dominates the eastern entrance to the city. The fort is almost inaccessible from the south side and provides extraordinary views. It hosted artillery positions and infantry defense of the Austro-Hungarian army during WWI. The bastion has been partially destroyed, but some parts are in good condition. North of the bastion is an army polygon, used by the army well after WWII. It was the crucial fortress in defence of Sarajevo in the 1914-1915 events.