While doing research for a London trip, I got to know about this place. this is located at the other end of bridge (where London eye exist), come down the stairs (left hand side facing big ben) and then pass under the bridge to London eye, you will see this little spot, where Elizabeth tower sync with the Arc and create a beautiful frame (voila- that is your insta worth shot)
It's definitely worth it. Also, walking along the Thames river towards Lambeth Bridge is a serene experience, especially around the fall season. read more