Isenburg, Medieval castle ruins in Hattingen, Germany

Isenburg is a stone ruin on a steep rocky spur above the Hattinger Ruhrschleife near Hattingen. Two broad wall sections meet at an angle: the taller right-hand section is built of light grey and tan blocks with a dark, uneven top edge and a small rectangular hole, while a lower wall runs leftward. Rough stone steps descend between them, and low foundation walls of dark stone form rectangular outlines in the grass in front.

Construction of the fortress began in 1193 as a strategic outpost for a noble family. Over the centuries the site was modified several times and eventually abandoned, becoming the ruin it is today.

The ruins show how noble families in the region lived and displayed their power through stone fortifications. Visitors can see the room layouts today and understand what role such castles played in medieval times.

The site is accessible on foot with paths across uneven ground, so sturdy shoes are recommended. A local organization maintains the ruins and offers guided tours for visitors interested in learning more about the site.

Remains of white plaster on the northern wall show that the castle was originally rendered and painted white or light-coloured, so the bare stone seen today is not its medieval appearance. The main tower had a horseshoe-shaped plan and, at about 20 metres wide, was one of the largest of its kind.