Where to go in Gyumri?

Horseshoe-shaped Fortress

Neither of the two forts within the horseshoe-shaped fortress participated in military operations; instead, they functioned primarily as deterrents to potential enemies. Constructed in the 1800s by the Russian Empire, the horseshoe castle consists of two smaller fortress-like structures attached to it. The fort features closed entrances and underground tunnels. An inclined tunnel, sealed with stones, is also present within the structure. While not actively engaged in military actions, the fortress and its defensive features served as part of the strategic defensive infrastructure established during that period.

Source: 1