Paris may have its Eiffel Tower, New York its Empire State but everybody wants a London Eye. Cities around the world - thought to include Boston, Toronto and Sydney - are interested in building a replica of the London Eye, the world's biggest ferris wheel, the attraction's main backer, British Airways, said on Tuesday. "There's no reason in principle why we could not build an identical Eye in other cities and we are evaluating the suggestions," a spokeswoman said.