It aired here in Los Angeles on KHJ/KCAL for its entire run.
I actually went to see a taping of its kids version, Gladiators 2000, which was on the air from 1994 to '96, and was also one of Ryan Seacrest's first hosting jobs. Like the parent show, this show also taped in the Gladiator Arena (AKA stage 3 at the CBS Studio Center), right across from the soundstage were the original Roseanne (and its revival) was taped during that same period. Counting the time were waiting in line to enter the studio, we were there for about 3-4 hours...a lot of it due to changing over from the different staging for each competition.