I'm pretty certain that the 30 millionth person was ME!
(Well.... actually I rode the Eye on June 4, but it obviously took until the next day to confirm the numbers. It was definitely me! No doubt whatsoever in my mind.)
The Eye is an impressive structure no matter which way you look at it.
This is looking at the Thames downstream, with St Paul's Cathedral in the centre of the picture and the Gherkin extreme right....
.... and upstream, Battersea Power Station in the distance.
Westminster Abbey is the light coloured building behind Big Ben.