More on Big Ben

Big Ben—which just marked its 150th birthday—is actually the name of the bell, not of the Houses of Parliament's famous clock tower that houses it.

But Big Ben is only a nickname. The bell's official name is "The Great Bell," which is much less distinctive.

For the record, Big Ben is more than 7 feet tall and weighs about 30,000 pounds. And this is what Big Ben sounds like at 12 o'clock: