Best Attractions near Opal Lake

Carved from a former granite quarry on Bornholm’s rugged northern tip near Allinge, Opal Lake (Opalsøen) is an emerald-blue basin ringed by steep cliffs on the Hammeren peninsula. Today this dramatic artificial lake is a striking nature playground: you can swim in deep, clear water, follow rocky trails around the shore, hike up to sweeping views over Hammerknuden and the Baltic, or test your nerve with cliff jumps and a summer zipline that flies out over the lake.

Hammeren crowns the northern tip of Bornholm with a dramatic granite headland of cliffs, heather‑clad hills and open sea views. This protected nature reserve near Allinge-Sandvig is criss-crossed by walking trails that weave between rocky coastline, grazing livestock, tranquil Hammersø lake and the historic Hammeren lighthouse. It is a compact but wonderfully varied landscape, ideal for half-day hikes, coastal photography and quiet encounters with Bornholm’s wild, wind-shaped scenery.

Crowning the granite headland of Hammerknuden at Bornholm’s northwestern tip, Hammeren Lighthouse is a compact 19th-century granite tower with one of the island’s most expansive views. Raised 82 meters above the Baltic Sea on Ørnebjerget and built in 1872 from nearby quarry stone, the former navigation beacon now welcomes visitors free of charge in the summer half of the year. Climb the short spiral of steps to the lantern for sweeping vistas over North Bornholm, Hammershus, Hammersø and, on clear days, the Swedish coast.

Den Våde Ovn is a dramatic sea cave carved into the rugged granite coast beneath Hammershus on Bornholm’s northwestern shore. Accessible only by boat, this roughly 70 m deep cleft cuts straight into the coastal cliff, creating an echoing rock corridor where green-tinged light, cool spray and the surge of the Baltic Sea combine. Boat trips from nearby Hammerhavn glide along towering cliff walls, past sculpted formations and bird ledges, before carefully nosing into the narrow opening of the cave itself for an unforgettable close-up of Bornholm’s wild coastline.

Salomons Kapel is a haunting medieval chapel ruin tucked beneath the granite cliffs of Hammerknuden on Bornholm’s far north coast. Built in the early 14th century to serve herring fishermen and traders along this once-bustling stretch of the Baltic, its roofless stone walls now frame big skies, crashing waves and sweeping sea views. Reached on foot along coastal trails, it blends island history, raw coastal scenery and a quietly contemplative atmosphere.

Løvehovederne is a striking coastal rock formation on Bornholm’s wild northwestern shore, near Allinge and the dramatic Hammershus cliff landscape. Here the granite coastline drops steeply into the Baltic, and weathered cliff faces resemble the profiles of lions gazing out to sea. It is a place of crashing waves, seabirds and far-reaching views, best appreciated on a coastal walk or from sightseeing boats that sail close to the rocks in calm conditions.

Perched dramatically on a cliff above the Baltic Sea at the northern tip of Bornholm, Hammershus Castle Ruins is the largest castle ruin in Northern Europe and one of Denmark’s most evocative historic sites. This sprawling medieval fortress, once the island’s power centre and a key stronghold in Baltic politics, now offers atmospheric stone walls, winding paths and sweeping sea views. Free to visit year-round, it combines layered history with rugged coastal scenery and an excellent modern visitor centre.

Perched above an active granite quarry on Bornholm’s rugged Hammerknuden, Moseløkken Stenbrudsmuseum offers a close-up look at the island’s stone industry past and present. In this compact working museum you wander between old drills, winches and cutting gear, see films and photos of granite extraction since the 19th century, and step out to viewpoints over the quarry where stone is still being worked today. It is an atmospheric blend of industrial heritage, geology and dramatic coastal landscape.

Tucked between Allinge and Sandvig on North Bornholm, Madsebakke is Denmark’s largest field of Bronze Age rock carvings. Up to 3,000 years old, the petroglyphs spread across a sloping granite outcrop, with ship figures, sun crosses and mysterious footprints picked out in red paint to make them visible. Simple paths, information boards and open farmland views create a tranquil, time‑slipping stop where you can stand exactly where ritual gatherings once took place.

Perched on the northernmost tip of Bornholm, Hammer Odde Lighthouse (Hammerodde Fyr) guards a rugged stretch of Baltic coastline where granite cliffs meet green-blue water. Built in 1895 as a supporting light to the higher Hammeren lighthouse, the compact 12 m granite tower still flashes twice every ten seconds to guide passing ships. Footpaths weave through heath and rocky shorelines, making this a rewarding stop on coastal hikes, with wide sea views, seabirds, and the sense of standing at the island’s very edge.