I am mainly obsessed with abandonded houses and empty towns. The area I live in is very modern and the powers that be here have a tendency to basically tear down anything "old" and rebuild with intense gusto. So, finding old stuff is not that easy. Plus, the constant influx of newcomers demands that new housing and new stores be built as fast as possible.
That said, I travel near and somewhat far to locate old homesteads and "ghost" towns.
I'll start by posting one of my all-time absolute favorite old houses. Built around 1880. Abandonded since I think the 1960's.