Three American hikers were detained last week by Iranian officials . A handful of tour operators provide tours for Americans to visit Iran . `` We want this matter brought to a resolution as soon as possible . '' A U.S. passport is valid in Iran ; visitors need a visa . Travel restrictions for Iran have been in place since the 1979 oil crisis .
Three American hikers were detained last week by Iranian officials . A handful of tour operators provide tours for Americans to visit Iran . A U.S. passport is valid in Iran ; visitors need a visa . Travel restrictions for Iran have been in place since the 1979 oil crisis .