With the ongoing 70th anniversary of Joe DiMaggio's famous 56-game hitting streak, many have called it baseball's most unbreakable record. While it may not be baseball's most unbreakable record, it is certainly one of many. With the ways the game has changed, many records will never be matched again.
I want to include a few clarifications:
1) I did not include anyone who used steroids for any "positive records." If someone broke an undesirable record while using steroids, I counted it anyway. The player most affected by this is Barry Bonds.
2) There are a couple records I did not include that are commonly thought to be unbreakable. They are
a) Single Season RBI - I think that while unlikely, this is breakable. Get a great on base guy and put him in front an Albert Pujols and you've got a chance. I think Adrian Gonzalez could make a run at this next year.
b) Single Season HR - I did not include this considering the record to be 61. If you consider the record to be 73, then it is unbreakable.
Most pictures courtesy of Getty Images or Wikimedia.