I adore a distinctive ambergris (deep) base and a quality (Bulgarian) rose oil. Anise woven into a perfume accord can have quite a haunting effect on me, too. These are the first that came to my mind. Funnily, I smelled a frankincense (boswellia sacra) essential oil a couple of days ago and it was quite a surprise/revelation to me. Good to have this as a reference.