/project_folder/
      manage.py
      settings.py
      urls.py
      __init__.py
      /app/
          views.py
          models.py
          __init__.py
          /templates/
                /admin/
                    base_site.html

(r'^admin/', include(admin.site.urls)),

TEMPLATE_DIRS = (
    os.path.join(PROJECT_PATH, 'templates/'),
)