The title is from Byron's poem <<https://www.scottishpoetrylibrary.org.uk/poem/lochnagar/|Lochnagar>>:  

*Away, ye gay landscapes, ye gardens of roses,*  
*In you let the minions of luxury rove,*  
*Restore me the rocks where the snow-flake reposes,  ...*  

*... I sigh for the valley of dark Lochnagar.*  