Now you can have your Iranian visa and not have it stamped in your passport.
I remember Cuba used to do this when I visited the Island in the 1990's
So if you travel to the US you need not worry.
Born in Ramsar, the closest Alborz mountain range gets to the Caspian sea. Displaced at 7, then again at 11 then again at 16. Studies medicine in Glasgow university. Works as a doctor in the UK for 8 year. Takes photography classes at the London Institute to travel the world. Learns Spanish in Havana University. Travels extensively in Venezuela.Has been guiding and offering authentic off the beaten path treks in northern Iran since 2009 to discerning travellers.