No? Really? Oh. Well, since you're here, it looks like this.
Question: What's creepier than a four-acre spiderweb?
Answer: Whatever the hell weaves a four-acre spiderweb. In this particular instance, the answer is "a Metric Sh*tTon," and/or "an Imperial Sh*tLoad" of spiders. Those aren't my units, by the way; I borrowed them from entomologist and bug-blogger Gwen Pearson, who recently provided some background on the photo (and some more precise numerical figures) over at Wired:
The Baltimore Wastewater Treatment Plant put out a call for "extreme spider" help in 2009, when a giant spiderweb covered almost 4 acres of their facility. Scientists eventually estimated over 107 million spiders were living in the structure, with densities of 35,176 spiders per m³ in spots.
...The scientists described their estimate of 35,176 spiders/m³ as "markedly conservative" and "representing a minimum volume" of spiders, by the way.
Emphasis Pearson's, because HOW OFTEN DO YOU HEAR SPIDERS DESCRIBED VOLUMETRICALLY?
The scientists catalog the web and its extensiveness in some detail, in "An Immense Concentration of Orb-Weaving Spiders With Communal Webbing in a Man-Made Structural Habitat." The report can be found here. It includes such descriptive gems as this one:
In places where the plant workers had swept aside the webbing to access equipment, the silk lay piled on the floor in rope-like clumps as thick as a fire hose.
Emphasis mine, because, despite having a soft spot for spiders, reading that still made me squirm.