Rain Vortex, Jewel Waterfall Changi Airport August 2021. The Rain Vortex, Jewel Waterfall , a game-changing hub for Singapore Changi Airport, the best ranked airport in the world, and a new tourism icon for Singapore. Jewel Changi Airport is a nature-themed entertainment and retail complex on the inside of Changi Airport, Singapore, linked to three of its passenger terminals. Its centerpiece is the world's tallest indoor waterfall.