Believe the hype and book well in advance. Chicago's most exciting restaurant—hidden in a bunker-like building on a residential block—demands an adventurous spirit, an ample appetite, and a serious commitment of time and money. If you have four hours and $300 to spare, the 23-course tasting menu is the best way to experience young whiz Grant Achatz's stunning cutting-edge food. The gastronomic roller coaster (there's also a less pricey 12-course version) takes you on a journey through intriguing aromas, visuals, flavors and textures. Buttery duck with extruded mango puree arrives perched on a pillow that emits juniper-scented air. A black truffle-bon bon explodes in your mouth when you bite. Brown butter turned into powder accompanies a skate fish fillet. Though some dishes—they range in size from one to four bites—may look like science projects, there's nothing gimmicky about the endless procession of bold and elegant tastes. The hours fly by in the windowless bi-level dining room, aided by the effortless service and muted decor.
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