The Heumarkt is at the end of Untere Straße in the Old Town.
In the past, it was used to get back up to the main street and thus to the middle gate, which until 1827 formed the end of the narrow, medieval city. The hay market, as its name suggests, used to be a place where hay was sold, and sometimes pigs could also be bought. Then as now, life pulsates in this square and there are colourful stores with interesting niche offers.
The Sume fountain by Stefan Engel, created on the Heumarkt in 1991, is dedicated to the children of the old town. In the past, the children who grew up on the Neckar were called "Neggasume" and Sume (seeds) are the small, transparent fish that have to grow up until they become real fish.