Assistens Kirkegård is the cemetery that's also a park — opened in 1760 to relieve the over-full inner-city churchyards, designed as a landscaped graveyard, and now functioning as both. Søren Kierkegaard, Hans Christian Andersen and Niels Bohr are all buried within a few minutes' walk of each other. The locals lie on the lawns between the graves in summer; the dead don't mind.
Three kilometres of slow walking, ninety minutes if you do the literary pilgrimage. Enter on the Kapelvej side off Nørrebrogade. The cemetery is a long rectangle running east; the famous graves are within the western half. Kierkegaard's stone is modest — name, dates, two lines from a hymn he wrote — a few minutes from H.C. Andersen's slightly larger marker. Niels Bohr is a short walk further, modern stone, the family plot.
Walk the central avenue — Hovedlinjen — east. Lime trees, plot numbers, the rhythm of a working cemetery doing its job under whatever sky the day's giving you. Walking among the dead in this particular cemetery is the closest Copenhagen comes to its own sublime.
End at the Jagtvej exit; Nørrebro S-tog is fifteen minutes north.