COLCHESTER, England (Reuters) - It is the home of Humpty Dumpty, Old King Cole and Camelot -- or so legend has it. But archeologists raking over the past can now go one better for the English city of Colchester. After painstaking excavation work they have proof of real heroes from the ancient world. Last month they revealed the remains of a Roman Circus or chariot racing track. In the past 30 years archeologists in the city have unearthed evidence dating back to Roman rule over 2,000 years ago, rewriting British history along the way. The circus underlines the city's importance...