Hohenburg, Medieval castle ruin in Lenggries, Germany

Hohenburg is a castle ruin near Lenggries where stone walls and tower fragments remain standing on elevated terrain overlooking the Isar River valley. The site contains wall sections, ramparts, a medieval well, and other structural elements scattered across the ground that reveal the fortress's medieval layout.

The castle was first documented around 1100 and served various noble families as a stronghold until a destructive fire destroyed much of it in 1707 during Austrian occupation. This fire ended its role as a residence and began the slow decline into the ruins seen today.

The site holds meaning for the local community as a tangible connection to the region's medieval past, visible in how people visit to walk among the ruins and understand their homeland's story. The castle's remains shape how residents and visitors perceive the landscape and their own place within it.

The site is accessible by marked walking trails that lead to preserved wall and rampart sections where visitors can explore the ruins at their own pace. The walk involves a gentle to moderate uphill climb, allowing views from different angles and vistas across the valley.

In 2004–06 geodesists from the Bundeswehr University in Neubiberg surveyed the ruin with lasers, making Hohenburg the first castle ruin in Bavaria to be captured as a virtual model. The castle association had 24 trees felled beforehand so the walls could be measured and seen again. A virtual fly-around is shown in the Lenggries local museum.