"Vertical Landscape" by Eiko Ojala. It looks like a paper landscape but the artist actually works digitally and hand-draws all the elements to look like they're cut out of people. (Hint: the shadows help!
"Post-Apocalyptic Warsaw" - Actually, this still looks a little early for the Fifth World. This is probably only 100 or 200 years in. After 400 years, most of those tall buildings would've fallen over.