Gurey,
http://www.newadvent.org/cathen/01767a.htm"Ascension
See also The Feast of the Ascension.
The elevation of Christ into heaven by His own power in presence of His disciples the fortieth day after His Resurrection. It is narrated in Mark 16:19, Luke 24:51, and in the first chapter of the Acts of the Apostles.
Although the place of the Ascension is not distinctly stated, it would appear from the Acts that it was Mount Olivet. Since after the Ascension the disciples are described as returning to Jerusalem from the mount that is called Olivet, which is near Jerusalem, within a Sabbath day's journey. Tradition has consecrated this site as the Mount of Ascension and Christian piety has memorialized the event by erecting over the site a basilica. St. Helena built the first memorial, which was destroyed by the Persians in 614, rebuilt in the eighth century, to be destroyed again, but rebuilt a second time by the crusaders. This the Moslems also destroyed, leaving only the octagonal structure which encloses the stone said to bear the imprint of the feet of Christ, that is now used as an oratory.
Not only is the fact of the Ascension related in the passages of Scripture cited above, but it is also elsewhere predicted and spoken of as an established fact. Thus, in John 6:63, Christ asks the Jews: "If then you shall see the son of Man ascend up where He was before?" and 20:17, He says to Mary Magdalen: "Do not touch Me, for I am not yet ascended to My Father, but go to My brethren, and say to them: I ascend to My Father and to your Father, to My God and to your God." Again, in Ephesians 4:8-10, and in Timothy 3:16, the Ascension of Christ is spoken of as an accepted fact. "