Kronborg Castle — Hamlet's Elsinore

Kronborg is the castle Shakespeare made immortal without ever seeing: his Elsinore, the setting of Hamlet, is this actual Renaissance fortress at Helsingør, where the Øresund narrows to four kilometres and Denmark spent four centuries taxing every ship that passed — the Sound Dues that made this the richest toll booth in European history and paid for the castle's sandstone splendour. English players toured here in the 1580s, some from Shakespeare's later circles; however the Dane learned of Elsinore, the castle has embraced the association completely, hosting Hamlet performances in the courtyard every summer since 1937 (Gielgud, Olivier, Burton and Jude Law have all died here professionally).

The visit layers well. The state rooms and the 62-metre ballroom — northern Europe's longest hall when built — carry the Renaissance swagger; the chapel survived the 1629 fire that gutted everything else and shows what the original interiors dared. The tapestry room keeps the surviving royal portraits woven for that ballroom. And below it all run the casemates: dark, dripping soldier-quarters where garrison troops wintered miserably — and where Holger Danske (Ogier the Dane) sits asleep in stone, the national legend who will wake when Denmark faces its darkest hour. Children take the statue very seriously. So, quietly, do the Danes.

The sea walls outside are free and half the experience: Sweden plainly visible across the water (Helsingborg's ferries shuttle constantly — the "booze cruise" run, in local anthropology), and the maritime museum next door occupies the old dry dock spectacularly for those making the day of it.

Getting there is easy and scenic: trains from Copenhagen's central station reach Helsingør in 45 minutes, the castle a ten-minute harbour walk from the platform. Book the timed castle ticket online (summer caps), aim for a morning arrival ahead of the tour groups, add the Louisiana Museum of Modern Art — one train stop back toward the city, and Denmark's best museum — for the canonical North Zealand day. In August, the Shakespeare festival makes the courtyard performance the reason to reverse the schedule entirely.