Question:
I wonder what is the easiest and fastest way to get Iran visa. 
Answer:
The fastest and easiest way to apply for an Iran visa is through a travel agency. Here are some useful links:
- Apply for your Iran visa through this link: Iran Visa Application
- Find a list of the Iranian Consulates all around the world: Iranian Embassies/Consulates
- The airports in Iran where you can collect your visa: What Iran airports can I get my Iran visa?
- You can find all the necessary information about Iran visas for any nationality: Iran visa
- Read more about: US, UK & Canadian Citizens Visiting Iran
- And finally, you can find a collection of questions about Iran visas here: Iran Visa Questions
