The Shard, London Bridge

I was near London Bridge this week when I caught sight of a concrete stump emerging from between the railway station and Guy's Hospital, usefully labelled "Shard". Concrete stump it may be now, but when it is completed in 2012 (the year of the London Olympics) it will be the UK's tallest building, and one of the city's most recognisable landmarks. And there won't be any concrete on show when it is finished: its architect Renzo Piano has compared the 310-metre building to a shard of glass. Have a look at this.