More electronics than paper...
From House of Cards (US) S01E01

Last September I came across a site devoted to photography of the Hell that is Detroit, Ruins From Old Detroit. Here is another photographer, James Griffioen, who also has been wandering around the living museum of Detroit. Instead of focusing on decayed landmarks he looks for absence, the empty blocks, the caved in houses, the feral dogs. The archeology record of grand buildings, palaces, shrines is glamorous, but the analysis of humbler buildings is also very useful.
Artificial Owl is a site "dedicated to provide on a daily basis a selection of the most fascinating abandoned man-made creations". They also provide exact locations of these sites. The above is a US antiballistic missile site that was built but never used.
While reading the comments in another blog, The Death of Johannesburg, I came across another blog of urban decay. Forgotten Detroit is about the great marooned and abandoned builgings of downtown Detroit. I have only visited Detroit once but it is hard not to impressed by these empty buildings surrounded by empty sidewalks, with non stopping/slowing cars speeding by. The site also includes before and after photos and floor plans.
Following a link in some comments I came across a blog The Death of Johannesburg, that chronicles the deterioration of that city since the ANC took power. South Africa, in the bad old days, was pointed as an example of racial oppression. It was also one of the richest cities in Africa if not the world. Now "Free" South Africa has a sky high murder and rape rate and many downtown Jo'burg buildings have been abandoned for security concerns and occupied by squatters.
The BLDGBLOG has an interview with urban spelunker Michael Cook. Read the interview then go to Michael blog Vanishing Point and look at sewers.