Höhingen Castle, Medieval castle ruins on Schlossberg hill in Achkarren, Germany.

Höhingen Castle consists of the stone remains of a medieval fortress on Schlossberg, rising about 150 meters above Achkarren village. The ruins still feature portions of the defensive walls and the original gate structure.

The castle itself is first explicitly documented in 1259, not 1064, when Achkarren was mentioned. In 1525 Achkarren peasants burned it during the Peasants' War, and it was rebuilt as a defensive fortification in 1620. Imperial troops burned it again in 1638, and from 1671 its stones were sold for the Neu-Breisach fortress.

The castle once represented local authority over the surrounding lands. Its ruins today stand as a reminder of how such fortifications shaped life in the valley.

The ruins are accessible via hiking trails from Achkarren village with routes of varying difficulty levels. Wearing sturdy shoes is advisable since the climb involves unpaved paths.

The castle gate's position still matches the 1644 engraving by Matthäus Merian, even though most of the ruin's stone was sold in 1671 and later reused for houses.