To be precise, the Changi Airport Skytrain (Terminal 2 to Terminal 3 line) is the one that physically travels through the center of the Jewel Changi Airport complex. This is a unique feature of the airport's design; the Skytrain track was integrated into the Jewel building so that passengers transferring between Terminals 2 and 3 can look out the window and get a spectacular, elevated view of the HSBC Rain Vortex (the world's tallest indoor waterfall) and the lush Shiseido Forest Valley. It is important to note that the Skytrain does not actually "stop" inside Jewel; there is no station there. To visit Jewel, you must exit the transit area (clear customs) and walk to the complex, which is connected via link bridges to Terminals 1, 2, and 3. The Skytrain ride is free and accessible to both "airside" (transit) passengers and "landside" (public) visitors, making it a popular "free attraction" for travelers who want a quick, cinematic glimpse of the architecture without spending hours exploring the mall itself.