Here are some unspecified places in Durmstrang, including, but not limited to: the Library, the Kitchens, Storage Facilities, the entrance to the Port, the Dueling Club Headquarters, Teacher's Offices, and the hallways.
Library: Durmstrang's library has walls and walls of books, both of legal material and otherwise, as well as hard wooden tables and torch lighting.
Lower Levels: The lower levels contain the kitchen, storage facilities, and the entrance to the port.
Dueling Club Headquarters: A place for students to practice their dueling skills. With a padded floor and seats around the edge of the room for spectators.