Bornholm Outdoor
Plan your outdoor time—ideas for all ages and different activity levels.
Hammershus • North Bornholm • medieval ruins • viewpoints • history & nature
Discover the secrets of Hammershus Castle Ruins on Bornholm
Hammershus is the largest medieval castle ruin in Northern Europe and one of Bornholm’s most iconic landmarks. Built in the 13th century on the granite massif of Hammeren, it offers dramatic coastal views and a unique mix of history and wild nature. Below you’ll find the story of the fortress, the visitor centre, nearby adventures, how to get there, and a practical FAQ.
Best for
views & history
Area
Hammeren / North
Time on site
1–3 hrs (or more)
Tip
combine with Hammerknuden
Hammershus: a medieval stronghold packed with stories
Sitting high above the sea on North Bornholm, the ruins of Hammershus are a cornerstone of Denmark’s cultural heritage and one of the most memorable sights on the island. First built in the mid-13th century, the fortress served for centuries as a strategic stronghold and a symbol of power.
Thick walls, defensive towers and the cliff-top location once made the castle hard to conquer. Today, walking through the ruins feels like stepping back in time—knights, conflicts and everyday castle life meet the raw landscapes of Hammeren.
The history of Hammershus
Hammershus dates back to the 13th century and is traditionally linked to the Archbishop of Lund, Jakob Erlandsen. The castle became a focal point in power struggles between the church and the Danish crown. After the destruction of Lilleborg in 1259, Hammershus rose in importance and became a key seat of authority on Bornholm.
In 1522, the castle and the island were pledged to the Hanseatic city of Lübeck as debt security. During that period the fortress saw its last major expansion. Behind the strong ramparts were living quarters as well as a prison, chapel, kitchen, granaries, stables and even a brewery.
One remarkable engineering feature is the system of two freshwater reservoirs built high above sea level. As artillery developed in the 17th century, the fortress gradually lost its military value and began to decay. In 1822, the ruins were declared a national monument, starting a long process of protection and conservation.
Look out for the medieval stone bridge leading towards the ruins—an exceptionally rare sight in Denmark.
Hammershus Visitor Centre
The modern visitor centre near the ruins is a great addition to your visit. The exhibition takes you into everyday life at the castle around 1575—how people lived, how the fortress functioned, and what made it such a powerful place. You’ll also find a café and spaces for talks and events, plus a terrace with a superb view towards the ruins.
The long footbridge leading towards the castle feels like a symbolic transition from modern architecture into the medieval landscape— worth including in your route.
Adventures in the shadow of Hammershus
Want to add a bit of adrenaline to your day in the north? Around Hammeren you’ll find fun outdoor options—from zipline vibes to guided SUP.
Zipline at Opal Lake
Big views and a quick rush above the Opal Lake area—an easy “extra stop” when exploring North Bornholm.
Rock climbing
Hammeren’s cliffs and granite formations are a great playground—join a session with an instructor if you’re new.
Guided SUP safari from Sandvig
Explore the coastline from the water—relaxed pace, stunning scenery. Book here →
Getting there
By bike
Great if you’re riding along the west coast—combine the visit with Allinge/Sandvig and the Hammeren area.
By bus (BAT)
From Nexø: line 7.
From Rønne: lines 1, 2, 7.
By car
Most convenient: park near the visitor centre, then walk towards the ruins.
Want more inspiration for an active Bornholm?
Explore more ideas—outdoor activities, photo experiences and inspiration for your next days on the island.
Nature photography on Bornholm
Granite cliffs, sandy beaches, heaths and forests—amazing subjects all season long.
Experience the night sky
Bornholm has low light pollution—autumn and winter are perfect for stargazing and night photography.
FAQ: Hammershus
How much time should I plan for Hammershus?
Typically 1–3 hours for the ruins and viewpoints. If you add Hammerknuden or the Opalsø/Hammersø area, plan for half a day.
Is Hammershus good for families with kids?
Yes, but take care on steeper paths and near edges/walls. Good shoes and close supervision are important.
Is there a place to eat or take a break nearby?
The easiest option is the visitor centre café. In season you’ll find more choices in Allinge and Sandvig.
What should I combine Hammershus with?
The best combo is Hammerknuden (scenic loop walk) plus the Opalsø and Hammersø area.
Plan Bornholm your way
Want to build a perfect North Bornholm day (Hammershus + Hammerknuden + Sandvig/Allinge) or add activities? Message us—we’ll help you pick the best route and order of stops.
