When I voted 80%, I did it with a very broad understanding of what a dungeon can be.
In my opinion, a dungeon can be the crypts, mines, caverns and other underground warrens we all know and love to varying degrees.
But a dungeon can also be a forest with scattered ruins on the hilltops, where the evil druids and their minions lurk in the valleys. It can be the shipyards where the local gang of thieves disappeared after picking a character's pockets. It could be the mysterious island where the character's ship ran aground during the storm.
For my purposes, I consider a 'dungeon' to be a site-based adventure where the characters can essentially control the rate or order in which they take on encounters to some degree. The degree to which the dungeon is isolated isn't relevant I think, as long as there is a neat demarcation to where the dungeon begins and ends.