Arg of Tabriz, also known as Arg Alishah, Arg-e Alishah, Arch of Alishah, Arg Citadel, and Ali-Shah Mosque, is the remnants of a big fortification and city wall in downtown Tabriz. Ark's structure is visible from far distances in downtown of Tabriz, if not blocked by newly high raised building.
The structure was initially raised as a mausoleum in 14th century during the Ilkhanate era. However, with the sudden death of the governor of the city and with some construction complications in constructing a roofed building without pillar for such a huge complex, the mausoleum structure remained incomplete. In the 19th century with the rise of tensions between Iran and Russia the structure rapidly turned into the city's fort and additional military installations such as a barracks and cannon foundry were added to the original structure. During the twentieth century the military installations were removed from original construction and the surrounding of the ark turned into a park. In the late twentieth century a big mosque was built next to the citadel.