King's College Chapel, Cambridge

A masterpiece of late Gothic architecture, built between 1446 and 1515, with the largest fan-vaulted ceiling in the world and magnificent stained glass. Rubens's Adoration of the Magi hangs behind the altar. The chapel's choir is world-famous; hear it at choral evensong during term time, free.

Afterwards, go punting on the River Cam past the colleges along 'the Backs', either self-hire or with a guide. The Fitzwilliam Museum is free. Cambridge is under an hour by train from London.