St. Paul's Cathedral

Worth it if you want the full interior experience and don't mind queuing with crowds—85k reviews averaging 4.5 suggest most people find it genuinely impressive rather than just ticking a box. Skip the paid entry if you're skint or short on time; the exterior from Millennium Bridge is free and the light show is the whole point anyway. That volume of bookable experiences means you can time it smart (early morning or late afternoon tours tend quieter), so do that rather than rocking up midday.

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