(Update: there have emerged a few journalists and photographers who consider these shots of Detroit not only "ruin porn" but also inaccurate. For this viewpoint go here.) For other ruin porn about the Midwest in general, try Troy Paiva's Lost America.
Pictures of Mayan cities are a combination of Tikal and Yaxha (taken by me).
Images of Detroit taken from Time photo essay and Viceland.
Originally I was going to do this with Detroit against pictures of Chernobyl as it looks today, but there wasn't enough of a contrast.