Albums that have aged well

Burzum - Hvis Lyset Tar Oss
Carcass - Symphonies of Sickness
Carcass - Necroticism
Cryptopsy - Blasphemy Made Flesh
Demilich - Nesphite
Emperor - In The Nightside Eclipse
Entombed - Left Hand Path
Entombed - Clandestine
Entombed - Wolverine Blues
Morbid Angel - Altars of Madness
Morbid Angel - Blessed are the Sick
My Dying Bride - Turn Loose the Swans
Necronomicon - Morbid Ritual
Nocturnus - The Key
Obituary - Slowly We Rot
Obituary - Cause of Death
Paradise Lost - Gothic
Paradise Lost - Icon
Sepultura - Beneath the Remains
Suffocation - Effigy of the Forgotten
 
AC/DC-ALL Bon Scott era albums
Black Sabbath-Black Sabbath, Paranoid, Master Of Reality, Volume 4, Sabbath Bloody Sabbath, Heaven And Hell, The Mob Rules, Dehumanizer
Carcass-Heartwork
Dio-Holy Diver, The Last In Line, Dream Evil, Lock Up The Wolves, Strange Highways
Death-Leprosy, Spiritual Healing, Human
Iron Maiden-The first seven studio albums
Led Zeppelin-ALL
Machine Head-Burn My Eyes
Metallica-The first five studio albums
Moonspell-Wolfheart
Morbid Angel-Blessed Are The Sick, Covenant
Ozzy-Blizzard Of Ozz, Diary Of A Madman, No More Tears
Opeth-Orchid
Overkill-The Years Of Decay, Horrorscope, W.F.O.
Elf-Self titled
Rainbow-Ritchie Blackmore's Rainbow, Rainbow Rising, Long Live Rock 'N Roll
Pantera-Cowboys From Hell, Vulgar Display Of Power, Far Beyond Driven
Samael-Ceremony Of Opposites
Slayer-Hell Awaits, Reign In Blood, South Of Heaven, Seasons In The Abyss, Divine Intervention
Sepultura-Arise, Chaos A.D.
Testament-Low
Tool-Opiate, Undertow
By the way, I know it's not metal but some of Tom Petty's older stuff is timeless in my opinion.
 
Triumphant Apostle said:
AC/DC-ALL Bon Scott era albums
Black Sabbath-Black Sabbath, Paranoid, Master Of Reality, Volume 4, Sabbath Bloody Sabbath, Heaven And Hell, The Mob Rules, Dehumanizer
Carcass-Heartwork
Dio-Holy Diver, The Last In Line, Dream Evil, Lock Up The Wolves, Strange Highways
Death-Leprosy, Spiritual Healing, Human
Iron Maiden-The first seven studio albums
Led Zeppelin-ALL
Machine Head-Burn My Eyes
Metallica-The first five studio albums
Moonspell-Wolfheart
Morbid Angel-Blessed Are The Sick, Covenant
Ozzy-Blizzard Of Ozz, Diary Of A Madman, No More Tears
Opeth-Orchid
Overkill-The Years Of Decay, Horrorscope, W.F.O.
Elf-Self titled
Rainbow-Ritchie Blackmore's Rainbow, Rainbow Rising, Long Live Rock 'N Roll
Pantera-Cowboys From Hell, Vulgar Display Of Power, Far Beyond Driven
Samael-Ceremony Of Opposites
Slayer-Hell Awaits, Reign In Blood, South Of Heaven, Seasons In The Abyss, Divine Intervention
Sepultura-Arise, Chaos A.D.
Testament-Low
Tool-Opiate, Undertow
By the way, I know it's not metal but some of Tom Petty's older stuff is timeless in my opinion.
Whoops...Forgot Megadeth's brilliant Rust In Peace album!
 
His copy and everyone else's. It's an older recording, before they had money.

And Then You'll Beg is the only album of theirs with truly excellent production.
 
Jesus, some of these lists are thorough.But i noticed a few albums that have wretched production- the music may hold up well, but the production could be improved in many of these albums.