Hell
From Homestar Runner Wiki
File:thedevil.png
Hell circa 1936
In Parsnips-A-Plenty, The Strong Bad falls off The Cliff and goes to Hell. The Devil runs Hell and The Kaiser is in there.
In Where the Crap Are We?, Homestar Runner suggests that he and Strong Bad are in heaven. Strong Bad posits that they are not, inferring that he is in Hell.
A glimpse of Hell can also be seen on Main Page 6.