Is there one?

I explored 2 dungeons, went to the 2nd floor, explored secrets, rooms, everything. Couldn't find the exit. I just got out of the starter city and wanted to wander around for a bit to experience the game. I suspected that one of the rooms will contain a portal, an exit, just like that starter dungeon, the prison...

Game bug or I need to come back the same way I came in. Only one entrance, which is also the exit ?

That would svck so much, spent like 3 hr making sure i explored that [censored] dungeon. I can go back adn out in a matter of minutes but I refuse to believe that's how dungeons work. I need a starting and a finish point: A to B. That makes sense to me....

The random dungeons in the wilderness (and I think the story dungeons, too) have only one way in or out. The entrance is the exit. What's so odd about that?