One of the places I would like to visit is Detroit. Nearly one million people have left from the city since the 1960's. Now population is little over 900,000. As a result of migration entire neighbourhoods have been left almost empty. This mean a lot of interesting places to see which all remind about the citys former glory. As we know Detroit was known for a long time as the 'car factory of the world' and almost every industry was somehow related to car manufacture. It would be great to do a pilgrimage to this city. I'm also a fan of soul music so it doesn't get better than this! (Detroit was one of the soul capitals).

Some locations photographed here:
http://www.detroitruins.net/locations.php

Many interesting museums:
http://www.detroithistorical.org/

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More interesting places

Bussana Vecchia, abandoned village in Italy. Because of several earthquakes it was considered too dangerous place to live.

http://www.bussana.com/vecchia/org/album_bv/BussanaVecchia/index.html

Bodie, California. A boomtown of 10,000 people in the 1880's was abandoned in the 1930's. Very well preserved place. (chicomarx posted already one picture of this place)

http://www.bodie.com/

Olympic village built in 1936 near Berlin. Immediately after the olympics it became a German military academy and later it was abandoned by Soviet army.

http://www.urban-travel.org/elstal/index.html