St Paul's with its soaring dome is a great place for panomaric views across London. More at http://www.stpauls.co.uk
It is not that easy to go to the dome as there are a lot of stairs and it is sometimes very narrow. I had troubles at one point with my camera bag on my back, and I am not big.
From the dome, you get to see Tate Modern, which is the industrial building transformed into a moderm art museum and the Millenium Bridge: http://www.megapixelworld.com/photography/showphoto.php?photo=643
It is in Tate Modern I took the photo of the giant spider: http://www.megapixelworld.com/photography/showphoto.php?photo=401
It is not there anymore unfortunately.
Still from the dome, at the right of the previous view, you get to see all the moderm buildings:
http://www.megapixelworld.com/photography/showphoto.php?photo=642
From the dome, but at the left you can see London Bridge. I haven't uploaded that photo yet.
Here's a view of St Paul's and its dome from Tate Modern:
http://www.megapixelworld.com/photography/showphoto.php?photo=3

Olly

The view is really amazing!!Impressive buildings!