@Niall Kielt my favourite Blind Guardian album is 'Nightfall in Middle Earth' which is based on Tolkien's
The Silmarillion. It's packed full of Blind Guardian classics such as 'Nightfall', 'Mirror, Mirror' and my favourite Blind Guardian song 'Time Stands Still (At the Iron Hill)'.
The preceding album 'Imaginations From The Other Side' is also a juggernaut and perhaps more accessible so might be a better place to start. It is more concise than 'Nightfall...' as it doesn't have any of the interludes required to link the story together.
It's up to you really, buddy.