Photo via Pexels. A general Baltic rocky-shore scene, not a specific Bornholm location.
Most of Denmark is flat, green and made of clay and sand. Then, far out in the Baltic Sea, closer to Sweden and Poland than to Copenhagen, there is an island made of granite. Cliffs rise from the water, forests grow over rocky ridges, and a thirteenth-century fortress crumbles on a headland. This is Bornholm, home to about 40,000 people, and it is unlike anywhere else in the country.
Danes know it as Solskinsøen, the sunshine island, because it regularly records more sunshine than the rest of Denmark. They come for cycling, smoked fish, ceramics and long summer evenings. Foreign visitors still tend to overlook it, which is part of the appeal. This guide covers what to see, what to eat and how to get there.
Why Bornholm Feels Different
Bornholm sits on a block of ancient bedrock, so its landscape has the rugged, rocky character you would expect from Sweden or Norway rather than from the Danish mainland. The north coast is all cliffs and coves, the south has pale dune beaches, and the middle is crossed by forest and small lakes. It is only around 40 kilometres long, so almost everything is within an easy day’s reach.
The island’s position has also shaped its history. It has changed hands between Denmark, Sweden and the Hanseatic powers over the centuries, and in May 1945 it was bombed and then occupied by Soviet forces until the following spring, long after the rest of Denmark had been liberated. That sense of being slightly apart still colours island life. If you have read our guide to the Faroe Islands, some of the same self-reliant island spirit will feel familiar here, in a much sunnier setting.
Hammershus: The Castle on the Cliff
The island’s best-known landmark is Hammershus, on the northwest tip, widely described as the largest medieval castle ruin in Northern Europe. Construction began in the thirteenth century, and the fortress served as a stronghold and, at times, a prison until it was abandoned in the eighteenth century. Its walls and towers now sprawl along a clifftop above the sea, and you can walk freely through the ruins.
Come in the late afternoon, when the light turns the stone gold and the day-trip crowds thin out. For more of Denmark’s fortresses and palaces, see our roundup of the best castles in Denmark.
The Four Round Churches
Bornholm is famous for its rundkirker, round churches built in the Middle Ages that doubled as lookout points and refuges against raiders from the sea. Four survive: Østerlars, Nylars, Nyker and Olsker. Østerlars is the largest and the most striking, with a thick central pillar and a ring of chapels around it. Nylars is notable for its runestone, and Olsker’s tall whitewashed tower rises above the northern fields.
Visiting all four makes a good cycling loop, and each church sits in a quiet village that rewards a stop for coffee.
Smokehouses and Sol over Gudhjem
Bornholm’s food identity is built on smoked fish. Herring, mackerel and salmon are smoked over alder wood in tall brick chimneys that dot the coastal towns, with Hasle, Svaneke and Gudhjem among the best-known places to find them. Many smokehouses are open to visitors, and you can eat fish still warm from the kiln.
The classic local dish is Sol over Gudhjem, “sun over Gudhjem”. It is a slice of rye bread topped with smoked herring, a raw egg yolk (the “sun”), radishes, chives and salt. It follows the same logic as the open sandwiches in our smørrebrød guide, just closer to the sea. Finish with something sweet: our wienerbrød guide explains the Danish pastry tradition that bakeries here carry on, and a glass of local spirit makes sense if you are curious about aquavit.
Beaches, Cliffs and Forest
For beach time, head to Dueodde in the south. Its sand is famously fine and pale, and the dunes behind it are backed by a lighthouse and pine woods. The north is the opposite: the Helligdomsklipperne, or Sanctuary Cliffs, near Gudhjem, are a stretch of sea cliffs and caves reached by coastal paths. Inland, the Almindingen forest has marked trails and the Ekkodalen, a rocky valley with a good echo.
If beaches are your main goal, our best beaches in Denmark guide covers the wider picture.
Christiansø: The Tiny Fortress Island
Off Bornholm’s northeast coast lie the Ertholmene, a handful of small islands, of which Christiansø is the one people visit. A seventeenth-century naval fortress still defines it. Roughly ninety people live here, there are no cars, and a stroll around the harbour, stone walls and towers takes only a couple of hours. A passenger ferry runs from Gudhjem in season, so check the schedule before planning a day trip.
Getting Around: Cycle If You Can
Bornholm is excellent cycling country, with an extensive network of dedicated bike paths, including routes along former railway lines. You can rent a bike in Rønne, Nexø or Gudhjem, and electric bikes make the hills much easier. If you enjoy two-wheeled sightseeing, our guide to the best bike tours in Copenhagen shows how much Danes love it, and Bornholm is the countryside version. Camping is also popular, and our camping in Denmark guide is a good starting point.
Practical Tips
- Getting there: You can fly to Rønne from Copenhagen, or take a ferry from Ystad in southern Sweden (about an hour and a half on the fast boat) or from Køge near Copenhagen on the slower overnight route. Check current timetables.
- When to go: June to August has the longest days and the warmest sea. May and September are quieter and cheaper, though some seasonal attractions and ferries run reduced schedules.
- Where to base yourself: Gudhjem and Svaneke are the postcard towns, Rønne is the largest and most practical, and Nexø is a working harbour with good smokehouses nearby.
- Time needed: Three to four days lets you see the main sights without rushing; a week suits cyclists.
For other idyllic corners of Denmark to pair with a Bornholm trip, browse our guide to Danish villages and small towns and the complete Copenhagen city guide, a natural starting point before you head out to the island.
Final Thoughts
Bornholm offers a different side of Denmark: rock instead of sand, sea cliffs instead of dunes, and a pace that slows down the moment the ferry docks. Between the castle ruins, the round churches, the smokehouse chimneys and the long cycle routes, it is one of the best-kept secrets in the Baltic. If you have already done Copenhagen, Bornholm may be your next Danish trip.
