I went to Iran, it was the most amazing 1-week trip vacation I've ever done (Damavand, Isfahan, Yazd, a bit of Tehran). Amazingly friendly people, everybody spoke english, most signs are dual farsi/english, and the best part - its completely untouched by mass tourism. Feels surreal in current world, in the best way possible.
Even if this trip would ban me for life from US which is practically impossible with current tech, trips like these are 100x worth it. Can't recommend enough.