In what is now Rödelheim's Solmspark, there has been a castle since 1250, and it is suspected that it existed since 1150, directly on the ford through the Nidda. The ford was part of the trade route between Frankfurt and Cologne, and the castle lords may have collected tolls for crossing it. After its eventful history spanning many centuries, the castle fell into disrepair and was therefore demolished in 1802. The owners, the counts of Solms-Rödelheim and Assenheim, built a classicist castle on the site of the castle core by 1859. This burned down in a bombing raid in 1944. The ruins were demolished in 1956, the area was leveled and laid out as a park meadow.
In 2003, the Rödelheim Local History and Heritage Association set itself the task of giving the population an impression of the castle's appearance and dimensions. Finally, in 2007, the bronze model was erected, an information board was installed and the course of the castle walls was re-paved. The paving allows walkers and visitors to actually visualize the dimensions of the castle. The entire complex was designed by the Frankfurt architect Horst Günter Kroneisen.
The bronze model itself represents the L-shaped castle building on a scale of 1:40. The covered entrance area can be seen in the inner corner of the L, and on the back the two-flight open staircase leading down to the garden. There is a stair tower at each of the three corners of the castle complex, with the eastern tower being striking due to its height and diameter. It stands on the site of the castle's old keep.
The model was created after averaging the dimensions based on the existing photographs and drawings of the castle. The foundation stone for the foundation of the heavy model base was laid in 2007 by the then mayor Petra Roth. A capsule was also sealed, which contains the foundation stone certificate, some Frankfurt daily newspapers, the Rödelheimer Main-Nidda-Boten and some euro coins.