History buffs will be glad to know that Time magazine has opened up its archives going all the way back to 1923. There is lots of fascinating stuff here. In many cases, the articles tell you more about American society at the time than about the subject. You could just browse around in here for hours.
I searched for "spain," just to see what would turn up, and this is some of what did:
A 1962 article on Spain after Franco.
A 1966 article on Spain's modernization.
1975: Franco dies.
1992: Before the Olympics.
1946: Spain after World War II.
1982: Felipe gets elected.
1931: The Republic takes over.
1936: One month into the Civil War.
1977: Spain's first election.
Fascinating stuff, full of useful information.