It's hard to believe you're in an airport when you enter the Jewel. With themed immersive gardens, a hedge maze, play areas, and foliage-lined walkways, it's somewhere between a greenhouse and an adventure park. The main star, though, is the HSBC Rain Vortex which lights up at night and throws colours around the Jewel. For the best view, head up the Canopy Bridge, which hangs 23-meters above ground.