I think that there have been very few "perfect" albums ever made. Here are some that I think that come pretty close to the mark. If it's awesome front to back and was well-produced and mixed considering the available equipment, here's what comes to mind:
Pink Floyd- The Wall, Dark Side of the Moon
The Who- Tommy, Who's Next
Led Zeppelin I, II, III, IV, Houses of the Holy
Deep Purple- Machine Head, In Rock
Dream Theater- Scenes From a Memory
Metallica- Master of Puppets
Iron Maiden- Number of the Beast, Piece of Mind
Judas Priest- Sad Wings of Destiny
Marty Friedman- Scenes
Black Sabbath- Black Sabbath, Paranoid
AC/DC- Anything with Bon Scott
U2- Joshua Tree
Queen - A Night at the Opera
Jethro Tull- Aqualung
Cream- Disraeli Gears