Greatest Revival of All Time

What are considered the greatest revivals of all time….who were the revivalists at the forefront of these extraordinary moves of God….and what exceptional graces, found first in the life of Jesus, did they model so passionately that the church in their day was transformed and millions of lost souls were saved? Do the answers to these questions hold a key to unlocking strategies that could in some way help unleash an outpouring of God’s Spirit in our day?