In 1998, I visited Iran.
This trip was part of a longer expedition, an overland truck trip from Kathmandu to Damascus. You know about overland trucks, right? Remember in Stalking the Wild Dik-Dik, when I went on that Dragoman truck around Ethiopia? Each truck is modified to have bus-style seats for passengers, a small fridge, a card table, a small library, safes, overhead nets or racks, storage space for luggage, camping gear and additional storage on top of the truck, and kitchen gear underneath. Trucks also carry spare parts and spare water/fuel.
Anyway, Americans were not getting into Iran independently or with groups when I signed up for the Kathmandu to Damascus overland truck trip. But I had a plan.
I'd read on this here Internet-thingy (yes, kids, we had Internet in 1998) that the way to get into Iran was to hire a special visa expediter. I hired an Iranian travel specialist in Switzerland and he did it! He got me a visa.
I didn't run around advertising my nationality inside Iran, but I didn't deny it either. Most people didn't seem to mind.
I posted some photos of Iran here and I'll scan in more tomorrow.