This seems to be a fairly popular urbanEx spot here in Fort Worth; information and photos of this place exist around the internet if you look for it. There were two other small groups of people there exploring the area when I visited. That said, it's a fun site with some pretty cool old machinery still there, and it is very accessible.
The history of this site seems to be pretty scarce on the web. What I could find out was that this place was built by Fort Worth as a municipal waste incinerator in the 50s. Apparently, environmental regulations enacted sometime in the 80s resulted in the incinerator's closure.
A lot of the old machinery is still inside, naturally covered in a fair amount of graffiti.
Here are photos of the trash pits and what I think are square collector chutes, respectively. The square trash collection chutes in pic 12 feeds into what I believe is the burner shown in pic 9 above. Although I'm not very well versed in trash burning so I could very well be wrong about these functions.
Pretty sure the holes in the back wall are bullet holes... but the place does seem to be relatively safe nowadays. Not sure if I'd show up here at night though.
The roof also has some scenic views.
Fun Fact: Apparently this place once had the nickname "Widget Town". There was an urban legend that a population of "Widgets" (midgets but a bit taller, I guess?) lived here and would throw you in the smokestack if you trespassed onto the property!