What is the strongest beer? I've always wondered what the strongest beer in the world is and how would taste.

Are there reliable historical records of a very strong beer? What would be the highest % alcohol that's Brewable for a beer? And also of course it would be great to know where to get such a beer from.
There are strains of Saccharomyces Cerevisiae (brewer's yeast) such as WLP099 - Super High Gravity Ale Yeast that reportedly can tolerate up to 25% alcohol by volume. 

The world's strongest beer is Snake Venom coming in at a colossal 67.5% abv. Sources cite it as freeze-distilled, where the beer is frozen and the ice (pure water) is drawn off, leaving a more concentrated beer behind. Although, comments in the same link cast doubt upon if the beer is truly the abv claimed.