Buffalo's former gargantuan Lackawanna Steel / Bethlehem Steel plant (1902-1982), Lackawanna, NY.
At one time, 22,000 were employed on the site (WWII) at what was once reportedly the 4th largest steel mill in the world. At its height of production in 1973, 40 million tons of steel was produced from this site.
fun fact: The Peace Bridge c.1927 crossing over the Niagara River from Buffalo to Fort Erie, Ontario, Canada was made from this steel. Also, the Golden Gate Bridge, and Empire State building.
Now a derelict site besides the Steel Winds (14x2.5 MW) wind turbine project, and Steel Sun which features thousands (26,000?) solar panels.
https://en.wikipedia.org/wiki/Steel_Winds
The remainder of the site is a growing, mostly light industrial base.