Hohenbaden Castle, Ruined hillside castle in Baden-Baden, Germany

Hohenbaden Castle is a medieval fortress situated on the west side of Battert rock, featuring numerous towers, defensive walls, and around one hundred interior rooms. The layout reflects a typical princely residence with multi-story building complexes and substantial fortifications.

Construction of the upper castle, the Hermannsbau, began around 1100 under Margrave Hermann II, and from 1112 the margraves called themselves after Baden. Around 1400 the Bernhardsbau was added, and Margrave Jakob I expanded the Gothic lower castle into an administrative centre with 100 rooms. In 1479 Christoph I moved the residence to the New Castle in the town; the old castle became a widow's seat and burned down in 1599.

The margraves took their title from the castle, giving the state of Baden its name. In the knights' hall stands a 4.10-metre wind harp with 120 nylon strings, built by harp maker Rüdiger Oppermann and installed in 1999; the wind sounds the notes C and G. A smaller wind harp hung here from 1851 to 1920.

Visitors can explore the castle during daylight hours, with a restaurant and refreshment kiosk available on-site. It is advisable to wear comfortable shoes, as the site sits on a hillside with steep paths to navigate while exploring.

In the ruined knights' hall stands a wind harp installed in 1999 by harp maker Rüdiger Oppermann, 4.10 metres tall with 120 nylon strings tuned to C and G. A smaller wind harp had already stood in the same hall from 1851 to 1920. A Staufer stele was set up in 2014 at the car park below the ruin.