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Extending for 1,247 feet (380 meters) across the curving dome of London’s landmark O2 Arena, the Up at The O2 rooftop walkway promises far-reaching vistas and open-air thrills. Equipped with climbing suits and safety harnesses, visitors traverse the fabric walkway with a guide, making their way up to an observation platform where spectacular 360-degree views of the River Thames, leafy Greenwich, and the glinting skyscrapers of Canary Wharf await.