I went to Lambeau Field before they renovated it.
In 1998, Lambeau was a surprisingly basic stadium, smaller than I thought it would be. But it's all the intangibles there (real-life "Field of Dreams", history, etc.).
I hear that the renovations done earlier this decade have made Lambeau Field the class of the NFL.
GOTR said it earlier, and he's right...there are synthetic fibers woven into the famous "Frozen Tundra".