According to IMDb, "Buffy the Vampire Slayer" was filmed in and around California. Its sets included Torrance High School, which served as the stand-in for Sunnydale High School, as well as the Angelus-Rosedale Cemetery, Castle Green Apartments, and California State University, Northridge, just to name a few of the real-life locations utilized by the show. However, could a location in "Buffy" go on to become an iconic landmark in the modern comedy classic "It's Always Sunny in Philadelphia?" Was Philadelphia, like the town of Sunnydale where much of "Buffy" takes place, also built on a hellmouth? That would certainly explain some of the characters' actions on "Always Sunny."
--Looper
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