Book excerpt: Bryson brings his unique brand of humour to travel writing as he shoulders his backpack, keeps a tight hold on his wallet and heads for Europe. Travelling with Stephen Katz--also his wonderful sidekick in A Walk in the Woods--he wanders from Hammerfest in the far north, to Istanbul on the cusp of Asia. As he makes his way round this incredibly varied continent, he retraces his travels as a student twenty years before with caustic hilarity.