Copenhagen was a herring village until Bishop Absalon fortified it in 1167. Follow the layers down: castle ruins under Christiansborg, Christian IV's Renaissance treasury, the 1794 palace fire, and five years of Nazi occupation.
The excavated foundations of Bishop Absalon's 1167 castle and the 1370 Copenhagen Castle sit in a cool cellar beneath the current palace. Ring wall, well and privy remain. Open daily 10:00–17:00 (Tue closed off-season); 70 DKK ruins only.
The Sun Chariot from 1400 BC, the Egtved Girl in her oak coffin, the Gundestrup silver cauldron and Denmark's Viking hoards fill the ground floor. Open Tue–Sun 10:00–17:00, closed Mondays. Adults 145 DKK, under 18 free.
Copenhagen's cathedral, founded 1191, rebuilt after the 1807 British bombardment flattened it. Thorvaldsen's marble Christ and the Twelve Apostles line the nave — the model for Mormon temple statues worldwide. Free entry, 08:00–17:00.
Christian IV's 1642 observatory, Europe's oldest still functioning, with a 209m spiral horse ramp instead of stairs — Tsar Peter the Great rode up it in 1716. 40 DKK, open 10:00–20:00 summer.
Christian IV's 1606 Dutch Renaissance summer house, kept as a royal chronology room by room. The basement Treasury holds the 1671 absolutist crown, the Order of the Elephant and the coronation swords. 145 DKK, 10:00–17:00.
Rebuilt in 2020 after arson destroyed the old building, this museum documents the 1940–45 occupation: illegal presses, the rescue of 7,000 Danish Jews to Sweden in October 1943, and the Holger Danske sabotage cells.
Denmark's first purpose-built museum, opened 1848 in an ochre neoclassical shell around the sculptor's own grave in the courtyard. Bertel Thorvaldsen's plaster models, antiquities and 1838 homecoming are the whole story of Danish Golden Age art.
The old naval dockyard island and the 1619 church where Denmark's admirals are buried — Niels Juel and Peder Tordenskjold among them. The carved oak altarpiece dates from 1661; Margrethe II married here in 1967.
Rows of ochre single-storey barracks built from 1631 to house the Royal Navy's crews, still lived in today. Sankt Pauls Gade holds the oldest 1631 stretch; a small museum at Sankt Pauls Gade 24 shows a preserved sailor's home.
Opened 1760 as a plague-era burial ground outside the ramparts, now a park where Copenhageners picnic between the graves of Hans Christian Andersen, Søren Kierkegaard and Niels Bohr. Open dawn to dusk, free.
J.C. Jacobsen's 1847 brewery district, where the Carlsberg Laboratory isolated pure yeast in 1883. The 1901 Elephant Gate's four granite elephants carry swastikas — an ancient sun symbol used decades before the Nazis took it.
Christian IV laid out this Dutch-style canal quarter in 1618 for merchants and shipyards. The abandoned Bådsmandsstræde barracks were squatted in 1971, becoming the Freetown Christiania commune — Denmark's longest-running social experiment.