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Difficult question! I'd say the most memorable/beautiful places are ones that I sort of just stumbled upon them while traveling. I guess that made them all the more attractive to me (no expectations).
The mountain village of Masca on Tenerife (one of the Canary Islands off the west coast of Africa) has to be one of my favorite chance discoveries:
Also, Jungmun Saekdal beach on South Korea's Jeju island was particularly fetching:
The third one is the exception to the rule (in that I actually purposely travelled there). Monument Valley is one of the prettiest things I've ever seen: