I came across these photos (taken in February 2009) on Flickr of an abandoned church in Cleveland, OH.
St. Joseph Byzantine Catholic Church (above: interior) was built in 1933, and was designed by architect Joseph E. Fronczak (or Franczak) of Buffalo, NY. I'm not sure who the mural artist was -- but they are very well done.
In the 1970s, parish members began migrating out of the city to the suburbs. The congregation dwindled. The great expense of maintaining the building and the grounds forced the congregation to abandon the location. Eventually, the building was taken over by the Greater Zion Hill Baptist Church community, who in turn abandoned the building. More photos of this church can be seen at Flickr at this link and this link.
Can we allow this to happen to any more of our ecclesiastical treasures?