My ones (not necessarily in this order):
King Crimson "In The Court Of The Crimson King"
Dream Theater "Images And Words"
Kings'X "Gretchen Goes To Nebraska"
Genesis "Selling England By The Pound"
Deep Purple "Made In Japan"
Beatles "White Double"
Jimi Hendrix "Experience Hendrix: The Best Of"
Now I'm discovering I could easily fill more than 100 albums and it would not be the definitive end...
Try to name your ones, just for the fun of it.