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Uncover the technological leaps forward that have enabled the world's largest observation wheel - the Singapore Flyer - to be built. The Singapore Flyer is the tallest observation wheel on Earth, rising 165 metres into the sky. It can whisk 1,260 passengers around hourly to see a stunning 45 km panorama of three different countries below. Count down the five major innovations in observation wheels like the original Ferris Wheel and London Eye that have allowed the world's highest observation wheel to be built.