Limbo

Limbo was a term for an in-between place.

The name originated from an Earth religion, in which it was the limb or edge of Hell. It was a temporary place for those who could not ascend to Heaven without the intervention of a savior. 

The Curator claimed that the Museum of Missing Ships was located in Limbo. James T. Kirk said Limbo didn't exist. 

The place through which the Legion of Super-Heroes' time bubble traveled was called Limbo.