Downtown is where the ambition goes vertical. The Burj Khalifa has been the tallest building on Earth since 2010, with observation decks from the 124th floor up to the 148th; at its feet, The Dubai Fountain performs on Burj Lake beside the vast Dubai Mall, itself a destination with an indoor waterfall, ice rink and aquarium. A short hop away, the torus-shaped Museum of the Future peers decades ahead, while the 150-metre Dubai Frame literally frames old Dubai on one side and the new city on the other — each landmark's audio guide unpacking the engineering, and the ego, behind it.