been to/ been in

[amaya]

What's the difference (if any) between 'I've been to Alaska' and 'i've been in Alaska'?

[Tdol]

Nothing really, though 'to' would be the preposition of choice for me.

[engee30]

And what if the situation is as follows:

I am in England now and want to say:

I have been in England since last month.
Could I also say:
'I have been to England since last month'?

And here's another similar situation:

I am not in England any more, I'm back in my home country. I want to say something about my experience:

I have been to England. (no matter when it was)
Could I also say:

'I have been in England'?

I just can't have it explained clearly to me by anyone in my class, please.