Bill,
I know what you mean. I just happened onto the demolition of a stereographic movie theater in the very first marine studio in the country (US). I'd been there a few times, and always thought 'I need to get back there and photograph that area' but never did. The last time we went to the park, they were in the middle of tearing the building down. I was able to get a stereo photograph of it before it was completely gone, but with the rate of 'progress' these days, you have to be on the ball or spend a lot of time wishing for the past.
This weekend I'll be photographing an old US 1 tourist stop 'monument' - a giant orange (the fruit) man - that is sitting in the parking lot of a delapidated building with a 'For Sale' sign in it's parking lot. I expect it to be gone before this time next year...
- Randy