First I want to share something with you that I thought was very interesting. Our guide told us that the bell is actually Big Ben & not the tower's name. We didn't initially know that and apparently many do not realize that. He then told us that our Liberty Bell in America is Big Ben's sister bell. Both bells were created in Whitechapel at the Bell Foundry. The foundry was founded in 1570 making it the oldest one in Britain. You can learn more HERE.
So with that being said, if you hadn't originally intended to see the tower and Big Ben perhaps I have persuaded you to change your mind. I have included a variety of angles in the city to get good views of the tower which many think is Big Ben. You can also tour the tower & find more information HERE.
As you can see from the photos there are a variety of angles to see the tower. Of course Big Ben can only be seen by doing the tour since it is within the tower. I highly suggest taking photographs from the opposite side of the river where The London Eye is located or while riding on the ferris wheel. Directly below the tower on the opposite street corner you can get a great shot as well.
The first time I locked eyes with the tower was while cross the bridge. You can get a variety of views of the tower from the bridges. Here you will find one map of what I mean from the bridges to put things into perspective I would go on the Hungerford or the bridge that runs parallel to the tower called the Westminster Bridge.