Cambridge in 3 days: King's College Chapel (built 1446–1547 — the world's largest fan-vault, 12 original 16th-century stained glass windows, the Rubens altarpiece valued at £100 million), Trinity College (33 Nobel laureates — more than France), the Eagle pub (Watson and Crick announced the double helix here on February 28 1953 — the most important scientific announcement made in any pub in history), the Backs (the most beautiful urban landscape in England), punting on the Cam, the Fitzwilliam Museum (free), King's College Evensong (free — the most beautiful choral music experience in England) and a punting picnic to the Orchard Tea Garden in Grantchester.