Cambridge rivals Oxford in architectural beauty and academic prestige, its magnificent college buildings and chapel spires reflected in the River Cam. King's College Chapel is a masterpiece of late Gothic architecture with the world's largest fan vault, while the Bridge of Sighs and Mathematical Bridge are iconic sights. Punting past the college "Backs" is a quintessential Cambridge experience, while world-class museums including the Fitzwilliam are free to enter. The city centre mixes medieval streets with modern shopping and a thriving café culture.