As well as providing an extraordinarily detailed history of keeping time from early Chinese experiments with water to the latest atomic clocks, this brilliant museum inside an equally impressive building offers an entirely unintentional lesson in metaphysics. More than just a scientific institution, it’s extremely likely that you’ll leave this place in a more philosophical frame of mind than when you arrived. Failing that, simply buy a ticket and marvel at the genius of humanity as you wander from room to room.