There were the cozy neighborhood stadiums of the early 20th century, the utilitarian monstrosities of the '70s, and now the vintage revival/space age dichotomy of the 21st century.
The Library of Congress has a fantastic collection of awesome old photos from the stadiums that no longer exist. When paired with photos from the Associated Press and Getty Images, they give you an idea of what going to a game was like 100 years ago.