Kehlsteinhaus is a mod made by ToMeanToDie (John Loftis). It was released in June 2003 after one year in the making.
The mod shares its title with the German name of the Eagle's Nest, Hitler's holiday home near Berchtesgaden on the German-Austrian border.
It was based on Ryan de Haast's Rising Evil, which is based on registered Wolfenstein. It features 30 levels with many new sounds and graphics.
Graphics come from a variety of resources, including John Bucksnort, AReyeP and Ariel via The Golden Episodes. Outside sources include the mutant replacement, which is a guard from Blake Stone.
As with its parent mod, Rising Evil, it is still only available in DOS.