The FLARE spa at the Four Seasons Hotel Pudong, Shanghai has an infinity edged indoor pool with a killer view of the Shanghai skyline.
Seriously, It doesn't get more decadent. Actually, it does! Rain shower for two, spa treatment rooms, ice fountains, heating rooms and whirlpools are also available. Not to mention your standard massages, facials, nail bar, and fitness center.
Sorry Leonardo DiCaprio, but this is the top of the world.