In shivering island, the roof of buildings could be explored. I wonder TESO would have buildings rooftop link together forming a pathway and there are ladders to climb up. U can find some NPC drinking ale or mead at their roof sitting on their chairs chilling out especially at the evening like a penthouse. And they wun do that if it's raining. Hope it wun be consider treapassing if u cross their roof and some quest can be obtained.

In the TESO intro video i see big mushroom.Would be happy to see if such mushroom having like a treehouse linked together by bridges . I would like to walk around such houses and enjoy the scenary

Completely with you on this - would love to see x, y, AND z axis fully explorable.

Considering they already removed this from the single player series, I'm not getting my hopes up ...