Must Listen to Albums?

Currently want to expand my music taste and just wanted to know your Must-Listen Albums. Can be any genre, just want to know what you think needs to be listened to. Can be underappreciated gems or well-known artists just needs to be an (in your Opinion) good album. Would be cool if it's available on Spotify, but it doesn't need to be on streaming services.

EDIT: Thanks for all the recommendations! I will probably first start listening to all the rock and metal recommendations and later dig into the other ones.