What is your favorite album cover?


I extremely love Rhythm Nation 1814 by Janet Jackson. Eschewing a friendly, fun image more conducive to '80s pop chart success, Janet Jackson adopted a militaristic tone for her instantly iconic black-and-white Rhythm Nation 1814 cover art.....That's why I like not only her song but also her soul in music. What about you? What is your favorite album cover?
tedguerrero
Gentle Giant Octopus & Low Spark...unusual shapes
Tull Thick As A Brick...funny!
Hendrix Axis: Bold As Love, Abraxis & Miles’ Live/Evil, Dead Blues For Allah...psychedelic 
Stones Some Girls...and Talking
Heads’ Remain In Light (b/c of what’s inside!)
"The Yes Album" and most of the other Yes album covers.  Roger Dean is quite the artist.

I also concur with the majority of the albums posted here.  There have been so many awesome album covers over the years.
Among the albums I own, one of my favorites is the cover to Wes Montgomery's "Road Songs."

https://www.allmusic.com/album/road-song-mw0000653406

The nice music is a bonus.
Houses of the Holy - Led Zeppelin
Yellow Submarine - The Beatles
Duke - Genesis
Year of the Cat - Al Stewart
Draw the Line - Aerosmith
Boston - Boston
Who’s Next - The Who
Art is very subjective. Jazz music, in my opinion, had the best album covers. Many will say the Blue Note covers (Francis Wolff photography) but even before that there were the amazing David Stone Martin works for Clef, Verve, and Pablo. Also Andy Warholl's work on three Kenny Burrell's covers are classics. Some of the CTI covers have nice photography as well. For more modern works:
War-The World Is A Ghetto
Jimi Hendrix-Electric Ladyland (the version with the girls on the cover)
Santana-Santana
Cheap Thrills-Big Brother and the Holding Company (Janis Joplin)
Deutsche Grammophon as a record label prefers fine art as subject matter for many of its pressings. Covers to numerous to include here.  
Casper David Friedrich and 
additional “Symbolist” artists are personally my favorites.....
Dark Side of the Moon because I used it every year as a prop when I taught lessons on dispersion of light.
Dark Side of the Moon / Floyd
Dazzle Ships / OMD
Atom Heart Mother / Floyd
Long Player / Faces
Then Play On / Fleetwood Mac

Santana's first album.

LOOK closely at the Lion head and what you see in it.

Once you see it, look more closely at what's making up what you see.

Great piece of Art by Lee Conklin.
Post removed 
Blonde on Blonde, one of the first rock gatefolds.
It really used the space with a fold out half-length photo of the artist in a suede jacket, the image slightly out of focus, seemingly alluding to the complex instrumentation of the music inside.
This iconic 1966 image rock-star image gave way a couple of years later to the backwoodsman image, still in the same jacket.
Happy 80th Bob.
Jethro Tull - Stand Up is a good one, also Roxy Music - For Your Pleasure as well as the first eponymous release. I also like the cover of Blue Skies by Stan Getz.
Brain Salad Surgery & Ambrosia's Road Island. It's a Ralph Steadman drawing.  
Court of the Crimson King is music room wall art. One of the best.
I know it's schmaltzy but 'Woodstock=Music From the Original Soundtrack and More'. I was a kid but loved the neighborhood hippies and that album photo identifies that period of my life. Too bad that era's culture changed so radically during the 1970's.
T. Rex - Electric Warrior (rock personified)
Miles Davis - Bitches Brew (also see Santana Abraxas & Miles Live)
Any Roger Dean cover (Yes, Osibisa, Uriah Heap, Asia, etc.)
It's a Beautiful Day
Zappa - Hot Rats
Bowie - Ziggy Stardust
Jane's Addiction - Nothing's Shocking
Guns 'n Roses - Appetite for Destruction (Robert Williams original)
The Dead - Axomoxoa (Rick Griffin is the BEST & his lettering is on many albums)
.....so many more......
Mustn't forget the amazing cover Rick Griffin did for the Grateful Dead - AOXOMOXOA!
I tried posting the photo but I guess Agon has a problem with full frontal female nudity.
Yes LG1...

I always liked looking @ Sgt. Pepper's cover while listening to it.

DeKay
My favorite album cover is iron maiden's piece of mind fantastic artwork.