Emirates Air Line

I seem to have an obsession to see how high up I can get to take a photo. I recently trudged up the Monument, see here for the pictures. The Monument is 202 ft (62 m) where as the Emirates Air Line is 300 ft (90 m). So far this is the highest I have been.

Maybe I will try the London Eye next and in February I will certainly be taking the view from the Shard.

Any other ideas? Feel free to comment.