it was not a guess from my point. It was great google Dada. I searched all the places I have visited in Sikkim (/so I knew the names Gangtok, tsongmo, baba mandir, lachen , lachung, yumthung ). Image search confirmed it's lachung.
It was one of the famous photos of Sikkim Tourism in various websites. If you click your own picture at a slightly different angle, it would have been difficult to guess.
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Now for some trivia..
Who's the only professional football player from Lachung??