adjective

poignant; evocative.

the sweet haunting sound of pan pipes

evocative,affecting,moving,touching,emotive,expressive,powerful,stirring,atmospheric,soul-stirring,poignant,nostalgic,wistful,plaintive,memorable,unforgettable,indelible,not/never to be forgotten

noun

the action of haunting a place.

the haunting of Calgarth Hall