Burg auf dem Falkenberg, Medieval castle ruins in Neugraben-Fischbek, Hamburg, Germany.

Burg auf dem Falkenberg is a medieval fortification in Hamburg situated on a crescent-shaped hilltop. The surviving remains include traces of the defensive works and ditches that once enclosed the structure.

Archaeological work in 1905 revealed that the site was occupied from the 9th to the 13th centuries, with pottery and metal objects found in ancient waste deposits. This long period of use shows how important the location was to communities during the Middle Ages.

The pirate legend is the site's best-known local tradition: Störtebeker and Gödeke Michels are said to have stayed at the castle and buried a treasure there before their capture and execution in 1401. A deep pit dug by treasure hunters was examined in 1905 and locally called Göd' sien Kuhl, which some read as a reference to Gödeke Michels. Excavated finds predate him, so the story is treated as legend.

The site lies in the Fischbecker Heide in Hamburg-Hausbruch, on a plateau 65 m above sea level; the dry ditch survives only as a step in the slope. No signposted path or marked route is recorded, and the 1974 construction of a septic tank damaged the ground monument. The terrain is a wooded slope with no visible masonry.

Local legends connect the site to pirates who allegedly hid treasure there before their capture in the early 1400s. These stories have become part of the place's identity and are often recounted by residents and visitors alike.