Most unreached places
There are 48,000 mosques but not a single church building.
Praying for different countries in the world, I started to pray for the most gnarly places, especially for christians: Afganistan, North Korea, Lybia and so on. To read how extreme the situation in some of those countries is should make us shiver. It's not that there is no God, or that there are no Christians in those countries. They just don't have the opportunity to share their faith with anybody; not that they do not live and share their faith, but that they have to lay down their lives for it - before they can even think about setting up a church building. I challenge you to pray and go!