One of the towers of this castle was rebuilt in the 19th century and is open to visitors.
The name Reutlingen was first mentioned in writing in the so-called Bempflingen Treaty (German: ) which is dated approximately 1089–90.
The first settlements in the area are believed to date from the 4th or 5th century.
Some time around 1030, Count Egino started to build a castle on top of the Achalm, one of the largest mountains in Reutlingen district (about 706 m).
It lies in the Southwest corner of Germany, right next to the Swabian Jura, and that is why it is often called The gate to the Swabian Jura (German: ).