The Solbrunnen in Bad Soden's spring park is one of many healing springs in the former health resort. The first mention of the fountain dates back to 1567. This year the brine spring was examined by the Frankfurt magistrate. As a result, the water was sent to the saltworks graduation tower in order to extract salt there. From 1854 the spring was used as a spa and drinking fountain; two years later the spring was relined and redirected to its current location.
The Bad Soden Hundertwasserhaus dates back to and takes its name from the Austrian artist Friedensreich Hundertwasser (1928-2000). The residential building, whose foundation stone was laid in November 1990, includes Bad Soden's first spa house, the Bockenheimer House, from 1722. There are 17 completely different apartments ranging from 120 to 230 square meters in the house, which has a nine-story, 30-meter-high tower.