Question about Acts 2:38: What about the martyrs?

[good samaritan]

Hades, Gehenna, Sheol, hell what ever you want to call it is a place. Heaven is also a place. I believe we don't totally understand the kingdom of heaven in our current state. The kingdom of heaven exists here and now, and at our second birth we become a part of that kingdom, but we shall one day inherit eternal life in the place that Jesus has went to prepare us. Samuel being summoned from the grave was before the the redemption paid at Calvary. Also was it really Samuel? IDK. conjecture.

I go to prepare a place for you. 3 And if I go and prepare a place for you, I will come again, and receive you unto myself;