Did the Resurrection of Christ actually happen?

This is a question for Christians, agnostics, atheists, and anyone else who would like to participate. Allow me to preface my questions by explaining that I fully understand that the Resurrection is the central doctrine in Christianity. However, was this an actual event with documented witnesses or is it a mere allegory to symbolize the spirituality of Christians? In other words, is it possible for a human to become resurrected?