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London 2012 Festival's Surprises: STREB

LONDON, ENGLAND - JULY 15: Dancers perform a routine in front of the National Gallery in Trafalgar Square as part of the 'One Extraordinary Day' performances on July 15, 2012 in London, England. The dancers are part of American choreographer Elizabeth Streb's 'Extreem Action' dance group which will perform around London for one day only and form part of the Cultural Olympiad. (Photo by Dan Kitwood/Getty Images)

Daredevil dancers sky-walk London landmarks

Daredevil dancers have sky-walked, bungee-jumped, and tumbled across some of the British capital's best-known landmarks ahead of the Olympic Games.