Your favorite 'concept' album


I'm not a concept album fan, however there are a few I've gone down the rabbit hole with. My personal fave, is '10,000 Years' by The Honeydogs. The backstory & lyrics are so vivid, and futuristic, it never fails to reveal something new to me. Even the bandleader said at times he's not sure what it's about.

Fascinating info & interview in the url. Check it out! 

Any others? 
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No mention yet of one of my favorites: Elton John “Captain Fantastic and the Brown Dirt Cowboy”
I forgot to mention the truly excellent Blue Sky Mining by Midnight Oil. A very special and moving work.
Pink Floyd - The Wall, DSOM, wish you were here 
Rush - 2112, Farewell to Kings
Moody Blues - Days of future past
The Who- Tommy
Rick Wakeman - six wives




I haven't seen my favorite mentioned yet, so here goes...
Genesis- The Lamb Lies Down On Broadway

Also as others have mentioned:

ELP- Pictures at an Exhibition
Supertramp-Crime of the Century
Quadrophenia
Tommy
Any Floyd released inclusive between Meddle and The Wall
Greendale (underrated Neil Young album)
Terrapin Station
Days of Future Passed