Initially, the collection was more than double the size of the current one, but several historically valuable items were melted down for their metal content. Many of the gun barrels are located either inside the halls or in front of the museum building, yet the majority is on display in the two artillery halls (buildings 2 and 17) which flank building 1, the former headquarters of the Arsenal. Building 2 - the one on the left as seen from the museum - is dedicated to the development of artillery from the Middle Ages until the 18th century.