Since its creation, the level of the Market Square has raised, in some places by over . Underneath there are large basements, the most famous of which is the Piwnica pod Baranami. Many cellars are now transformed into pubs and restaurants; other include the Theater "Maszkaron" and a small archeological museum in the basement of the St. Adalbert's church. There are passages linking some of the basements, such as the one linking the Town Hall Tower with the Cloth Hall. The Hall itself has a little-known underground trading hall, 100 meters wide (328 ft) and 5 meters high (16.4 ft). Near Sienna Street there is another underground hall ("Kramy Bogate"), with of trading area.