Since Tate Modern opened in 2000 in the former power station building, it's become one of London's biggest tourist attractions. Upon entering the gallery you are greeted by a cavernous hall, which different artists have tried to fill; from a huge golden sun to a large tube that snaked from one end to the other.
Most of the museum is free, except the regular special exhibitions that cover a particular artist or movement. If this is you first visit, the free galleries will be enough for anyone's stamina. The exhibition is split into four themes, rather than any chronological grouping, allowing for some interesting combinations of different artists and eras. The collection spans from 1900 to the present day.
There is a very good shop stocking the usual souvenirs, as well as a varied collection of art and design books and magazines that you wouldn't find in more general book shops.
The best way to beat the crowds is to go on Friday or Saturday evenings, it's open until 10pm. When you've finished go up to the bar/restaurant, which will give you a great view accross the Thames and the city at night.
Nearest tubes are Southwark (Jubilee Line) and Blackfriars (District and Circle Lines), both about ten minutes walk away.
There is also a 'Tate boat' runs along the Thames between Tate Britain, the London Eye and Tate Modern.
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