Hammershus

Hammershus is a medieval castle ruin on the northern tip of the Danish island of Bornholm, dating to the 13th century and frequently described as the largest medieval fortress in northern Europe. The ruins occupy a rocky headland and are a prominent regional landmark.

Visitors can explore extensive ruined curtain walls, towers and inner courtyards perched on a basalt promontory with open sea views. Interpretive panels and a nearby visitor centre explain the site’s military architecture and regional importance, and paths lead around the headland for coastal vistas.

Construction began in the 13th century as an episcopal and noble stronghold; control passed between church and crown during the medieval period. The fortress saw sieges and use as a power base and prison before falling into disuse and becoming a protected ruin in later centuries.

The site occupies a rocky promontory on the northern coast of Bornholm in the Baltic Sea, close to the towns of Allinge and Gudhjem. It is reached by road and short walks from the island’s main coastal routes.

• Visitor centre and access: A visitor centre near the site provides maps, an exhibition about the fortress and marked walking paths onto the promontory.

What to See #

• North Tower (keep): Largest surviving tower within the ruin, offering views over the fortress and the Baltic Sea from its elevated position on the promontory.
• Curtain walls and gate: Remnants of the castle curtain walls, gate passages and defensive earthworks that define the outer extent of the medieval complex.
• Chapel and domestic ruins: Ruined chapel area and adjacent domestic foundations that indicate the religious and administrative functions of the site during the Middle Ages.