On Podvalna Street, at the beginning of a small but beautiful square is the Powder Tower. According to archeological data, this historical attraction of Lviv was built in the second half of the XVI century. The material for its construction were stones from the dismantled in 1554 City Arsenal.
The Powder Tower was a part of the fortification system of the city. Four more towers of the same kind stood on the Governor’s ramparts. But, unfortunately, only one of them has survived to our times.
The tower was located on the earthen rampart behind the defensive fortifications and a deep moat with water and guarded the approaches to the city from the eastern side. It has the shape of a cut ellipse, the rounded side of which faces the suburb. 
The tower is covered with a sharp pinnacle of a roof. In the rough two-meter high walls and in the lower part of the three-meter high walls, made of stone, are made small windows-boynits.
They served for firing large-caliber guns. The tower was also used for storing provisions and for storage of gunpowder and ammunition, which is why it got its name. In the times when Galicia was part of the Austro-Hungarian Empire, there were barracks here, and then artillery workshops.
In 1895 the city bought the Powder Tower from the army. In 1956, it was reconstructed, mainly affecting the interior, and the entrance was decorated with two sleeping lions. After that, the building housed the Lviv organization of the Union of Architects of Ukraine.