A historical European town devoid of people does not work as a liminal space picture at all, because it still looks nice; and neither do the postapocalyptic settings that Japan is so fond of (YKK etc.). Eastern European commieblock and UK Brutalist hellscapes are actually quite similar in terms of the feeling they evoke, and have their own fandoms, but are considered their own genre - so I would conclude that "liminal space porn" is spaces only made tolerable by commercialism with the commercialism taken away, and the related "/r/UrbanHell" material is spaces only made tolerable by human habitation with that taken away or suppressed (e.g. if the humans are so bereft of vitality that they can no longer overcome the space's badness).