Jewel Changi Airport (also known as Jewel) is a nature-themed entertainment and retail complex surrounded by and linked to Terminals 1, 2, and 3 of Changi Airport in Singapore. Its centrepiece is the world's tallest indoor waterfall, the Rain Vortex, which is surrounded by a terraced forest setting. Jewel includes gardens, attractions, a hotel, about 300 retail and dining outlets, as well as early baggage check-in facilities.

From Wikipedia