Soaring above the glimmering skyline of Dubai, set in the heart of Downtown Dubai, is the jaw-dropping Burj Khalifa. At 828 metres, it is the world's tallest skyscraper, placing Dubai on the top of yet another world list. Admiring the stunning feat of architecture from the ground alone is a treat for the eyes, but the real treat lies inside, specifically on the 124th and 148th floors, where two observation decks afford you probably the best city views that you'd ever see.