I mean ones which seem to get better, mature, reveal different aspects or just plain never get worse. I've been thinking about it a lot recently, as I've been convinced The Monitor by Titus Andronicus was my favourite album ever, but I haven't really had the same buzz listening to it last few months (probably cos i'm attuned to their new album atm).
Anyway, there are so few albums which don't fade at some point (if you listen to them enough). The one stand out for me is Funeral. It always blows me away how vital it always feels when I pick it up. Apart from Wake Up which kinda sounds like an advert song now.