You need to visit Paro,Thimphu and Punakha which are the main places. Voter id card,pan card,passport,adhar card is all what you need.
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You need your passport/ Indian voter ID card, driving license and car permit. For details check the link below Know Everything before Planning a Trip to Bhutan -
Hi Saheli, Is it necessary to take passport? Voter ID card/ Adhar card is not enough?