The Museum of National History fills the royal apartments and ballrooms of Frederiksborg Castle with five centuries of Danish portraits, royal regalia and elaborately decorated chambers. Founded in 1878 with money from the Carlsberg brewing fortune, it is essentially the Danish national portrait gallery — a slow walk-through tells you who mattered in this country from 1500 to last week, from absolute monarchs to scientists, politicians and footballers.
The most spectacular spaces are the Knights' Hall, with its coffered ceiling, and the Castle Chapel where Danish kings were anointed for three centuries. Allow at least two hours; a full half-day is not too much. Admission also covers the formal gardens behind the castle.