To a certain degree, I answered that question while writing the screenplay for Hotel California.
In the past, various prophets and writers had visions of Heaven, Hell, Purgatory, and points in between.
To me, the above were long term destinations for spirits. However, I was interested in short term holding areas. Something along the line of a "Grand Hotel for Ghosts" or a "Grand Central Station For Souls".
There were also questions about memory loss and identity loss between lives.
Basically, I just "asked and knocked" as suggested in Christ's Beatitudes in the Bible.
We all have a spiritual journey to complete in life. Hopefully, this material helps you with yours.
Www.log-line.com (At first, we see through a glass darkly, then face to face)
St Johns