I'm 99% sure, based on what I've read, that during the game week when a party moves along the board that they are allowed to 'skip' over an explored dungeon (as long as they roll for all of the possible encounters they have crossed) and land on the next unexplored dungeon space or city. I base this assumption on this FAQ
Q: Can the party land on or move through a dungeon location that has been explored using a week's move action?
A: They may end on or move through the location. They may not re-enter an already explored dungeon.
It seems that the answer is yes, they can move through the location (in a single weeks move action)
But I would love some affirmation because I could also see that as a poorly worded (as many things are in these rulebooks) clarification that an explored dungeon is not a road block. Thank you for any input.