It was a bolt from the blue

I took this photo in London, England, the UK. I was mistakenly thinking that this world's famous Clock Tower was named Big Ben, and was renamed as the Elizabeth Tower in 2012 to celebrate the Diamond Jubilee. But one of my English acquaintances corrected my big misunderstanding. He said Big Ben is the name for the giant bell of this clock tower. I didn't even know that the clock tower had a giant bell inside. It is often said that you learn something new every day, but I thought this one would be the biggest learning of the year.