Built in 1905, the town hall has impressive statues of Hans Christian Andersen and Niels Bohr, the Nobel Prize-winning physicist. Jens Olsen's World Clock is open for viewing Monday to Friday 11am to 2pm and Saturday at noon. Frederik IX set the clock on December 15, 1955. The clockwork is so exact that it's accurate to within half a second every 300 years. Climb the tower for an impressive view, but it's not for the faint of heart -- 300 steps with no elevator.