Big Ben actually refers to the biggest bell. The building is truly named the Elizabeth Tower after Queen Elizabeth II, and is the third largest free-standing clock tower in the world. It stands adjacent to the Houses of Parliament in London England. Like The Houses of Parliament, it is built in a Neo-gothic style, and has kept time for the city since it was completed in 1856. This clock is known as one of the most reliable clocks in the world because it has never stopped ticking, even through the bombings in London during WWII. You can even set your watch by it!
The Math of the Dimensions