One of the most beautiful churches I've ever visited – truly breathtaking. Unlike Westminster Abbey, the crowds here are much more manageable, which makes the experience so much more enjoyable. Booking via Klook was very hassle-free, which made the whole trip smoother. I'd highly recommend setting aside at least 2–3 hours to fully take in the church and climb the 500+ steps to the dome. Yes, it's exhausting (and not for everyone), but if you're able to do it, it's absolutely worth it. A must-do when you're here!