Originally built in the mid-15th century, this space once stored the city's armoury, munitions, cannons and gunpowder. In the 1800s it was rebuilt and expanded into its current neo-Gothic state to hold the vast library and collections of the Czartoryski Princes, until the collection was moved across the street to ul. Św. Marka 17 in the 1960s. Since then Kraków's former Arsenal has been used to showcase various segments of the famous Czartoryski collection, including a long stint as the Gallery of Ancient Art. Closed since the acquisition of the Czartoryski collection by the Kraków National Museum in 2016, the primary collection of the Czartoryski Museum across the street will finally reopen on December 20, 2019, and plans are to reopen the Arsenal with a new exhibit in spring of 2020.