In the light of the recent tragic event in Nepal, the question arose in my mind whether observant Jews ought specifically to travel to the far east where avodah zarah is intrinsic to the society?
Shaarei Kedusha Part 4 Gate 3
And all the time that the soul of man clings to him, may He be blessed in this way, no bad thing will happen to him, and he will not ever come to error in any matter of his matters, whether in intellectual or emotional, and he will not fall in the hand of chance (the natural order) because as he's clinging with G-d, he is above all happenings, and rules over them. And in honor of H' may He be blessed, he should be careful not to cling his thoughts in Him except in clean places, and not in dirty alleyways, and not with unclean hands, and not in front of idols, or the like. And I heard from a wise G-d fearing man, that he saw the pious Rebi Yitchak the son of the Ravad z''l who he served, and he said that the pious man (R.Yitzchak) all of his days, his physical eyes did not see anything because he was blind, and when he needed to go to some place, he would say to his student who went with him that when he reaches a place of idol worship, hurry your footsteps as much as possible. And it appears to me that all of this he did in honor of H-shem, may He be blessed, because he needed to not think while in a place of ultimate tuma (impurity) thoughts of Him which is the ultimate kedusha (holiness). And he would hurry to passover in order to return to the point where he left off.
so it seems better to avoid such places if possible.