Seeing Big Ben in person is an awesome and almost surreal experience given what a famous landmark it is. The connected Houses of Parliament are very beautiful to look at as well. There are a ton of great photo opportunities of the Houses and Parliament and Big Ben from the nearby bridge. I would recommend trying to be at Big Ben at a time when you know it will ring. We were there at 11 AM and it was so cool hearing the bells in person!! I would consider Big Ben as a not-to-be-missed attraction in London!