VoCo Spawn Base
For over a year, the spawn base was simply a meeting point made of lavacast to deter griefers, and was continually griefed and rebuilt since it was founded in June 2015. After the dupe glitch of 1.11 , the area was terraformed and reconstructed into an obsidian megastructure.
Some groups have attempted to grief 420 911, but their attempts prove to be insufficient and trivial. The Vortex Coalition has a dedicated team that continually rebuilds the spawn base. All griefs were getting repaired within hours.
Even after griefers had spent hours severely withering the structure, it is still recognizable as a permanent mark on spawn.