What are your favourite gaming levels/stages?

[RCTjunkie]

One in particular is the "M" world in Noki Bay @ SMS
In Zelda: Stone Tower Temple of MM, That one temple with the rising and falling water in WW
Mario Kart: Can't go wrong with Coconut Mall

Roller Coaster Tycoon: Karts & Coasters, Mel's World, Thunder Rock