Imperial War Museum is a must. Also the British Museum, the Victoria and Albert and the Science Museum are all fantastic and all free. The Tower of London is expensive, but well worth doing at least once.
Stonehenge is a must. There's nothing else like it. I'd take a train to Salisbury from Waterloo station, see Salisbury Cathedral, stop for lunch and a pint at the Haunch of Venison (pub from the 14th century) and then take a bus tour to Stonehenge.
A great walk in London is from Victoria station to Buckingham Palace, from BP to Trafalgar Square on the Mall (pronounced Mal) through the Admiralty Arch to Trafalgar Square, Nelson's Column and the National Portrait Gallery, then down Whitehall past 10 Downing St & Churchhill's underground bunker to the Houses of Parliment, the London Eye and Westminster Abbey. You could make a nice day of it if you stopped at all the museums along the way.
Last edited by natman; 01/17/12.
