Arsenal (2003-04)
Perhaps the single greatest achievement made by any team in Premier League history. No team is good enough to go an entire league season unbeaten, even Barcelona ended up losing to Levante, last weekend.
Arsenal did it, though. They somehow managed to do the impossible. A total of 49 matches unbeaten is no small matter. Arsene Wenger, at the prime of his managerial career, really created a monster.
Another team being discussed, another team with a solid backbone. A perfect mix of strength, skill and character. Every player stepped up, none so more than captain Patrick Vieira, who ran the midfield in games.
Up front, Thierry Henry and Dennis Bergkamp were pure class. Not as flashy and powerful as Man City, but more than effective nonetheless. This is another feat that is never going to be repeated by any team in the Premier League.