the wellcome gallery is a mix between arts and science. it is very interesting and the exhibitions, especially the one of the moment about sleep and dreams, are great.
it is free and stays open until 10.00 on thursday nights.
no way you will lose yourself while looking for it, it is located opposite Euston tu be station and very well lit!
the design is very modern and pure and makes you feel really comfortable.
I personnally love the fact that they explain facts in a scientific manner but also mix arts and history with it. it makes it less boring in my opinion.
it take a long time to browse through the different exhibitions so plan to spend a good amount of time there. (at least 1 hour and a half for the sleep exhibition)

A brand new museum close to the British Library and Euston station, the Wellcome Collection is pretty much unique in its dedication to 'considering what it means to be human'. It does this through exhibitions with intriguing titles like 'the heart' and 'sleeping and dreaming', complemented by an impressive range of illuminating talks and film screenings.