There is something strange yet intriguing about exploring vaults and crypts. If this sounds interesting to you, visit Ahmed-i Hani Tomb.
You'll be spoiled for sightseeing choice when in Dogubayazıt. Ahmed-i Hani Tomb is a great place to start here, but there are numerous other interesting spots to visit. Doğubayazıt Castle, Ishak Pasha Palace, and Mt Ararat are not far from the tomb site and will fill in your day nicely.