Man there's so many routes to go with rock music, greatest rock album ever for me is Led Zeppelin IV or Nevermind by Nirvana
But the cool thing about rock music is you tend to grow into different genre's of Rock once you get into it, like my first rock album ever was Back In Black by AC/DC(A lot of hipsters hate on it but i think its cool), then i got into the other classic rock staples, Zepp, Nazareth, Sabbath, Floyd, Ozzy, etc. From there a nikka needed something heavier, and i started listening to NWOBHM stuff like Motorhead, Maiden, Diamond head, and especially Venom. From there,I started fukking with old Metallica, Slayer, Exodus, Overkill(you know thrash stuff), then from there cannibal corpse, death, deicide that heavy Death Metal type stuff, and this went on for years and years, until now where i've been listening to Black Metal shyt like Mayhem, Dartkthrone, Leviathan, Xasthur etc.
I also really got into punk in my teenage years, I started with the early stuff, sex pistols, ramones, clash, and ended up with the hardcore shyt like DK, Minor Threat, Black Flag, and the GOAT punk band Bad Brains. I also really fukk with Crust Punk too
But i decided to go the heavier route, there's a lot of softer ways to go, like alternative shyt, you know Nirvana(once again Nevermind is probably one of the greatest albums in human history, In Utero is perfect too), Red Hot Chili Peppers, the pixies, butthole surfers, etc. Best genre of Rock for prettier shyt is Shoegaze tho man, shyt like My Bloody Valentine, its so beautiful
sorry got OD off topic there, at some points i wasnt even talking about rock and more about metal/other shyt but as for some albums you should listen too
Paranoid by Black Sabbath
Dark side of the moon by pink floyd
led zeppelin IV
nevermind by nirvana
Hair of the dog by Nazareth
Blizzard Of Ozz by Ozzy
those are the dadrock essentials, you didnt really give too much info on what kind of rock your looking for so i figure i'll just recommend the kind of shyt i think is cool