Great place for photography, views are out of this world if you like spectacular. And I love spectacular, this is St Alfege church in the Centre. Been there for over a thousand years this wonderful church makes the most superb pic if you are patient with the traffic! Further details of this historical beauty here.
And just around the corner is the Cutty Sark despite its age of design you can still see the lines in this beautiful ship that say purpose, and speed!
And finally the riverside, lots of pics taken. But as it was getting cold, and there were bars calling my name by this time. For my American friends, Greenwich is east of London centre just follow the river down. a lot of the 2012 Olympics took place here.