First Riddle:

You're traveling and reach a fork in the road with a house sitting between the split streets. One street leads to heaven and the other leads to hell. There's a sign out front that says;

'Two sisters live here
One always lies and one always tells the truth
But you may only ask one question.'

You go up and knock on the door. You obviously want to be directed towards heaven, so which single question do you ask that will invariably point you in the right direction?