funny, was just talking today with some guys at work...
in no particular order
1. gun range
2. racetrack
3. Woodshop
4. old books
5. old museums or buildings
6. fresh cut grass
7. my grandmother's kitchen when I was seven years old about 1967 (if I close my eyes and think about it I can almost smell it)
coffee, bacon, 20 years of cooking smells)