Seeing I started with "Number of the Beast" because it was my first Maiden album, I'll skip to 1983's record, "Piece of Mind". Another one of the best recordings Maiden did, they replaced their old drummer and Nicko McBrain was a perfect fit. The other band members also started contributing more material, not just relying on Harris's songwriting, making them even stronger as a group.
One of the Greatest songs in Maiden's catalog, The Trooper:
Another excellent album cover, CD's just can't compare to the old Vinyl masterpieces.
And you like Led Zeppelin so that's very interesting! I always thought of Iron Maiden as the continuation of Led Zeppelin's progressive metal leanings heard in songs like Immigrant Song, Achilles Last Stand, The Song Remains The Same, etc. Maiden took it a bit further with their imagery and power.
It is a good album Taha, but it's not the next in line.
After Piece of Mind, came Powerslave recorded in 1984. When taken in sequence, Number of the Beast, Piece of Mind and Powerslave are considered Maiden's best albums, "The Holy Trilogy of Metal",,,well of Maiden's discography anyway.
Recorded with the same line-up for the first time, which definitely helped the continuity of the band, this record displays Maiden at their best, stretching their creative muscles and giving us some unforgettable songs.