Last week, when we went to see Evita (which didn't live up to the hype for us - it's now closed) we saw the Gormley statues in the area of the Hayward's Gallery
These are dotted about on the rooftops, on both banks of the Thames. It's a little creepy, and I'm sure that they must have asked permission of the police (lots of phone calls from people who've only seen the one about attempted suicides!)
On the way home from the Blue Man Group I spotted another statue on Waterloo Bridge, standing on the pavement.
I know it's not a big deal for people who see it all the time (e.g. Da Wife) - but I thought it was quite cool, so took a photo - which I present here for your amusement.