"I'm looking for concepts with words that describe them that exist  in one language but not commonly, if at all, in another.  e.g. 'Rincón' is Spanish for the interior angle of a corner, and 'esquina' which is the exterior. Yes, we have 'nook' but we don't usually say, ""Set it in the nook."", when your guest asks where he can put his umbrella."
What are concepts in other languages for which there is no English word/phrase?