h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

Verrrrry big. No place to hide. A trans-dimensional goldfish bowl-cum-knocking shop, teeming with Londoners of a certain age and genotype, all compulsively eyeing and being eyed. It is a statistical certainty that you will bump into at least three people you know conversationally, and spot half-a-dozen more you never wanted to have to speak to again, thus forcing you to sidle along the walls in the hope of getting away before they clock you. At the same time, the half-a-dozen people who were hoping that you'd dropped off the face of the Earth will be doing exactly the same thing.

Great views from windows and roof box, especially of Millennium Bridge which flexes gracefully over the river like a snake's skeleton. But show me any Thames-side elevated view in London at sunset that isn't intrinsically alluring.

The Bourgeois towers are fun in a fairy-tale way, and provide a near-faultless platform for attention-seekers of all aesthetic permutations. I bear witness.

And as for the galleries....