Jewel Changi Airport, Singapore

Jewel Changi Airport, completed in 2019, houses the world's largest indoor waterfall—the 40-metre Rain Vortex—within a donut-shaped glass and steel structure that sustains 2,000 trees and over 100,000 plants. Its ETFE dome harvests rainwater to power the waterfall and building cooling systems, embodying a functioning ecosystem. This integration of retail and nature outperforms #2 The Edge in aesthetic appeal, with 40% more plant species per square metre than the average green building. The Rain Vortex alone recycles 500,000 litres of rainwater daily, setting a global benchmark for biophilic design in airports.