Nicodemus Tessin the Elder designed this building in the 1670s. After a fire in 1680, the renovations were supervised by his son, Tessin the Younger - architect of the Royal Palace. Renovations in 2003 spruced up the entrance and the peaceful courtyard, where you can sit and enjoy goodies from the café, which is decorated with fixings from an early 20th-century bakery. Temporary exhibitions are on the ground floor. A series of rooms on the floor named Stockholm Through All Times is a journey through the growth of the city from medieval times to the 17th century. The third floor takes you through the realistic models of a Stockholm factory from 1897, plus a city registrar's office and schoolroom from the same period. Don't miss peeking into the two reconstructed flats from the 1940s; one of these tiny rooms housed a family, plus additional lodgers. On the ground floor, Torget, a children's play area, re-creates a city market square and is open at weekends. This is Söder's best museum and a great place to learn about the city.