Where are places that you haven't gone to and if you were younger/older/richer/better looking/more athletic/etc would go? Is there a place that you have always wanted to explore, but know you'll never get the chance to do so? Is there something that you've always wanted to do and never did it, and probably never will? Where is your undiscovered country?
And perhaps the more important question to ask: Why is it your undiscovered country?