Double albums have always attracted so many. There's more music. Double albums have been big statements. Some would call them concept albums. Often, double albums, present a band's best achievements.
Electric Ladyland Cover
Double albums are (were) popular and Jonny Hughes of goliath.com put together a list of fifteen. Look this over. You may or may not agree on the order, but the list is remarkable. This is a good reference. Use this to explore and add to your own playlists.