The Tower of Druaga -the Aegis of URUK-

[Munsu]

So, the town they went into in the second episode is certainly inside the Tower? When I first saw it, I thought they simply went to a nearby town leaving through the lowest floor or some shit. Might need to watch it again, can someone confirm?

[Ryllharu]

If you look at the outside of the Tower at the final frames of the first episode, you can see intertwining and sweeping...bark? Growth? Superstructure, whatever, at the base of the Tower. It kinda looks like a tree.

When they approach the city in the second episode, and the camera pans out to cover the whole city, you see the same exact formations from the inside, with the appropriate amount of light streaming through the spaces between the intertwining growth (for lack of a better term).