Where is This in Africa?

You are looking at one of the largest churches on earth. It took 1500 workers just under four years and cost $300 million to build, doubling the national debt of this already poor country in West Africa. It can accommodate 18,000 worshipers on any given Sunday, unfortunately there aren't even close to that number of Catholics attending regular services here. It is constructed entirely of marble imported from Italy. Where is this?

Click here for the answer along with more information about this destination.

_{Image © Sierra Hutchinson}