Opened in 1939, a year before the Nazi invasion of Denmark, this aquarium is worth a look only if you happen to be visiting the grounds of Charlottenlund Slot at Hellerup, a coastal suburb of Copenhagen. After walking through the grounds (the palace is not open), site of a royal residence since 1690, drop in at the aquarium. Although it was enlarged in 1974, it still features only 90 or so tanks with sharks, turtles, piranhas, and fish that can survive in the North Sea as well as those from more tropical waters.