It's a question on which a lot of science fantasy type stuff is based - and it would be fascinating if we could go back and see what would have happened if, for instance:
1). William the Conqueror had lost the Battle of Hastings, and Harold (and the Saxon British) had remained in power;
2). It...
Late 1940s. WW!! over, NHS and welfare state legislation being brought about by the best government we ever had. Hard times, but real hope for the future, real dreams that this time there really would be a home fit for heroes.
If I could time travel, I'd like to visit Edwardian times too (so...
That wouldn't have stopped Moslems (aka the Moors) invading Europe up through the Iberian peninsuar until they were driven back by the Spanish. Trouble is, you might have banished our own religion(s) but other people would have kept their's.