Hessian Castle is the ancestral home of the family of Count Karajan and the setting of the second act of Mark of the Ninja. It is located somewhere in Eastern Europe. He has since made it the headquarters of Hessian Services, his private security company.
| Mark of the Ninja Levels |
|---|
| Outset: Hisomu-jo, Home of the Hisomu Clan Ink & Dreams Act I: Oshi City, the Urban Jungle Act II: Hessian Castle, the Fortress of Count Karajan Act III: Tabriz, Source of the Sumi Finale: Return to Hisomu-jo |