We do not know just how long Mary lived after Jesus left this earth. But probably a number of years. I would imagine she was very kind to the poor and the sick, and spent some time each day in prayer. I always thought of her going to receive her daily bread at the early church Mass at that time, and how much that must have meant to her to receive her son in Communion. I can only imagine what that must have been like.
We do know that Jesus asked St. John, the apostle, to take her into his home as he spent his last minutes on the Cross. So it may very well be that she was living with St. John until the end.
There were holy women who were very close to Jesus who followed him and supported him from their own private funds during his time on earth. And I would think that Mary also gave of herself to support the early church as well.
But we don’t know how many years after Jesus lived that Mary too was taken up into heaven to be by her son again.
The assumption of Mary into heaven is a sign also of all of us being assumed someday into heaven bodily at the final coming. The assumption is also a close relationship with the Ascension of Jesus, which too is a sign of our bodies someday being assumed and being with him in heaven.
Both the ascension and assumption encourage us to look forward to the day when we too will be with him wholistically when Jesus comes to make it all happen for us beyond our dreams. What great mysteries of happiness and hope.
As for Gethamane, almost everything that existed at the time of Jesus in Jerusalem was completely destroyed by the Roman Army’s siege and destruction of Jerusalem in AD 70. Even the trees were uprooted.
You will enjoy learning about the House of Loreto - the house in which Jesus, Mary and Joseph probably lived. Tradition says it was miraculously brought to Italy by angels. (Loreto is a town in Italy.) The house itself is very small - but a large basilica was built around it. Enjoy. catholictradition.org/Mary/loreto1.htm
Mary is mentioned once in the New Testament after Our Lord’s Resurrection
Acts 1:12 Then they returned to Jerusalem from the mount called Olivet, which is near Jerusalem, a sabbath day’s journey away; 1:13 and when they had entered, they went up to the upper room, where they were staying, Peter and John and James and Andrew, Philip and Thomas, Bartholomew and Matthew, James the son of Alphaeus and Simon the Zealot and Judas the son of James. 1:14 All these with one accord devoted themselves to prayer,** together with the women and Mary the mother of Jesus**, and with his brothers.
Jesus’s tomb probably would have been a cavity, possibly rock-cut, that would have filled up with sediment over the centuries. Archaeologists would have to find a distinct feature or characteristic of the tomb and then dig it all up, which is difficult. However, three pilgrimage sites claim to be the tomb of Christ. Ordered by popularity: