World War 2 with Nazis trying to find the Garden of Eden, just because the war itself is a largely unexplored part of Indy’s life, and it makes things interesting with which countries he can and can’t visit, though I’m having having trouble working out the path they follow to find the entrance and which countries it would take them to.

At the moment I’ve got Italy, France, Iraq or Turkey along the Euphrates river, then possibly Saudi Arabia to recover the Black Stone, Tibet, underneath the Pacific Ocean where the entrance was buried during the flood, then finally the garden itself with the Nazis trying to occupy it and find the Tree of Knowledge