23 A witness to the resurrection of Jesus is Tabitha also, who was in His name raised from the dead; for how shall we disbelieve that Christ is risen, when even His Name raised the dead? The sea also bears witness to the resurrection of Jesus, as you have heard before. The drought of fishes also testifies, and the fire of coals there, and the fish laid thereon. Peter also bears witness, who had erst denied Him thrice, and who then thrice confessed Him; and was commanded to feed His spiritual sheep. To this day stands Mount Olivet, still to the eyes of the faithful all but displaying Him Who ascended on a cloud, and the heavenly gate of His ascension. For from heaven He descended to Bethlehem, but to heaven He ascended from the Mount of Olives; at the former place beginning His conflicts among men, but in the latter, crowned after them. You have therefore many witnesses; you have this very place of the Resurrection; you have also the place of the Ascension towards the east; you have also for witnesses the Angels which there bore testimony; and the cloud on which He went up, and the disciples who came down from that place.
Source: Catechetical Lectures (New Advent)