(FORTUNE Magazine) – In the Zagat Survey, some restaurants are known for their "Rainbow Factor," named for New York City's Rainbow Room--spots where the rating for decor far outclasses that of the food. Few places have higher RFs than the nation's revolving restaurants--but they're fun for holidays, like...April Fool's Day. --Ronald B. Lieber

Food Decor Service Cost ATLANTA Sun Dial 18 24 19 $27 210 Peachtree St. 404-589-7506

CAMBRIDGE, MASS. Spinnaker Italia 16 24 17 $24 575 Memorial Dr. 617-492-1234

DALLAS Antares 19 25 19 $29 300 Reunion Blvd. 214-712-7145

DETROIT The Summit 18 23 17 $27 Renaissance Center 313-568-8600

SEATTLE Space Needle Restaurant 14 23 17 $29 Fifth Ave. & Broad St. 206-443-2100

TORONTO 360 Revolving Restaurant 14 22 15 $33 301 Front St. W. 416-362-5411

0-9 poor to fair 10-19 good to very good 20-25 very good to excellent 26-30 extraordinary to perfection

Cost reflects the estimated price of a dinner with one drink and tip.

ZAGAT SURVEY