
Opalsøen
The lake fills a disused granite quarry on the Hammeren Peninsula and is surrounded by steep rock faces. A hiking trail leads around the shore; there are no railings at the edges, so be careful when looking down.

Denmark
Hammershus Castle Ruin sits on a cliff at Bornholm's northwest tip and is considered Northern Europe's largest. Hiking paths lead all around the Hammeren peninsula.
by Felix Gillen
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