Big Ben is the largest four-faced clock in the world, and each of its dials bears a Latin inscription that translates as "O Lord, keep our Queen Victoria the First safe." πŸ‘‘ It chimes every 15 minutes, and the sound can be heard from up to 8 km away β€” hard to miss it. πŸ€·β€β™‚οΈ

My favorite fact, though, is a different one: every year the clock is calibrated using an old English penny. πŸͺ™ If it's running fast, a coin is added to the pendulum. If it's running slow, a coin is taken away. That simple. πŸ•›