I discovered this little museum when tickets for the Rynek Underground were sold out, but am glad I did. It proved to be interesting in its own right, and basically featured the development of Krakow as an urban center from 1257 to the early 20th c. There are a number of interesting scale models of the city over time, a weapons and shield collection, lots of historic photographs, medals, coins, portraits of local intelligentsia, some tools, and scientific stuff - even a hot air balloon! The building itself is interesting, dating from the 1600's, and featuring many architectural and ornamental details, and a courtyard with a collonaded loggia. It has served many purposes, including a private residential palace, a bishop's residence, revolutionary committee headquarters in 1848, and the recruitment office for the Polish Legion in 1914. Admission was free the day I visited.