Answer: You really didn't provide nearly enough information so I can't positively identify it, but here are two educated guesses:
Caldochortus albus, also called Globe Lily, with large spherical to rounded, paper-thin puffs and narrow green foliage; or Fritillaria thunbergh or F. raddeana, both with large creamy white flowers. Flowers hide within the foliage.
If neither are the plant in question, try looking through the Eyewitness Garden Handbook on bulbs, DK Publishers 1997, ISBN 0-7894-1454-6
Best wishes in your search!
Q&A Library Searching Tips