I think travel to Iran is OK, per the link I posted above. The info sheet says:

"TRAVEL - All transactions ordinarily incident to travel to or from Iran, including the importation of accompanied baggage for strictly personal use, payment of maintenance and living expenses and acquisition of goods or services for personal use are permitted."

It says something similar for North Korea (that we're allowed to travel there without restriction or permission), and GW Bush lifted the sanctions on Libya in September, 2004.