NVHQ
The "NVHQ" (short for "New Valkyria Headquarters") base series was constructed by Minecart11 and his allies from "New Valkyria" mostly in the first two years of 9b9t´s existance. Their bases were infamous for lasting weeks at most, and thus were quite regularly rebuilt, making the "NVHQ" base series one of, if not the longest base series in 9b9t history.