[londons_explore]

The question at the border is "Have you ever visited Iran?", Not "Do you have a stamp for Iran in this passport?".

Since passenger lists on flights around the world are pretty much public information, the US immigration services will know exactly where you have visited in the past, and could totally put you in prison for lying when answering the question.

[klipt]

> The question at the border is "Have you ever visited Iran?"

Is that something only people on ESTA get asked? Never heard of people on visas being asked that.

[verst]

They ask that questions also during student or work visa issuance - and even during the greencard (adjustment of status) and naturalization processes. They don't ask it every time you enter with these visas or statuses however.

But as a US citizen you will never be asked. And better yet if you are a dual citizen like me. Then you can travel on your other passport to the places the US finds to be undesirable.

[klipt]

I think green card and naturalization ask about travel in the last few years. But they don't ask about travel prior to that, and they don't ask about Iran specifically.

[verst]

True - I think it was 10 (or was it 7?) year of travel history, but I'm sure Iran would raise some flags.