This massive spider web was located in the city of Baltimore’s Wastewater Treatment Plant, that's about as long as 3 football fields. How many spiders does it take to build a web that big? 107 million Long-Jawed Orb Weaving Spiders! The giant web was documented in 2010, by entomologist Albert Greene in his paper entitled, "An Immense Concentration of Orb-Weaving Spiders With Communal Webbing in a Man-Made Structural Habitat.”