Hochbunker August-Lütgens-Park, World War II air raid shelter in Altona-Altstadt, Hamburg, Germany.

This multi-story concrete bunker stands approximately 65 feet (20 meters) tall and was originally constructed to protect hospital staff and patients during wartime air raids in the early 1940s.

Built around 1940 as one of six operational bunkers serving the Altona General Hospital, this structure provided refuge for hundreds during World War II bombing campaigns over Hamburg.

The murals on the tower, with green foliage shapes, a dark figure and white speckled patterns, were painted over the wartime concrete and are visible from August-Lütgens-Park. Large black symbols mark the right edge of the facade, and a small blue graffiti tag sits near the base on the left.

The bunker stands in August-Lütgens-Park in Altona-Altstadt, with entrances on the park side; the climbing holds on the tower face are reached on foot from the park paths. Bus and S-Bahn stops on Thadenstraße and Gerichtstraße lie within about 250 metres. The ground in front of the tower is open park lawn.

Since 2007, the exterior of the bunker has been equipped with approximately 800 climbing holds, transforming the historic structure into a free outdoor climbing facility known as Kletter-August.