He isn't a professional photographer, he is a jet pilot by day, or night I guess, depending. But he has an amazing collection of photographs he has taken of various abandoned buildings in Europe. I believe a lot of them are in Belgium, however he has covered a lot of ground in the time he has been doing this. 

He is Henk van Rensbergen, his website is http://www.abandoned-places.com/

Here are a few of my favorites from his collections. Although I really like them all. I highly recommend checking out his galleries, he has back stories for most of the buildings, and a running narration through a lot of the galleries.