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Bala Hissar, meaning "High Fort," is an ancient fortress in the southern part of old Kabul, Afghanistan. It was likely built around the 5th century AD. The fort sits at the edge of Kuh-e-Shēr Darwāzah (Lion’s Door) mountain, just south of modern Kabul’s city center. The Walls of Kabul, standing 20 feet (6.1 m) high and 12 feet (3.7 m) thick, extend from the fortress, following the mountain ridge in a wide curve down to the river. The fortress has multiple gates for access, and the Kōh-e Shēr Darwāzah mountain rises behind it. In 1880, the British destroyed Bala Hissar.
Originally, Bala Hissar was divided into two sections: the lower fortress, which housed stables, barracks, and three royal palaces, and the upper fortress, which contained the armory and Kabul’s infamous dungeon, the "Black Pit" (Siyah Chal).