Book your slot at least three weeks out or stay home; walk-ins do not exist. You shimmy through a tight Neolithic passage into a stone chamber that feels like a brutalist sci-fi set. Spend your 45-minute tour hunting for 12th-century Viking runes—essentially medieval trash talk etched into the walls. Cameras are banned inside, so keep your phone in your pocket and actually look at the 5,000-year-old masonry. It is weirdly intimate and entirely worth the effort.
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