I have found 2 places with no entrance points. They are completely isolated - no doors, no windows, just four walls. I found first one in the Ancient Maze. Not sure about another -- maybe it was Kree. Both have some items on the floor -- a dagger at the first location, and gold at the second. I tried Spatial Distortion and Body of Air spells, but I couldn't get inside. Any way to enter those four walls with no doors and windows?