Red Tape varies from country to country and also largely differs depending of your very nationality. Therefore, we won’t start to be specific here. Do your homework before visiting one place:
- Is a visa required for your nationality?
- Where is the last possible place to apply for a visa? You cannot get visas everywhere, sometimes it might even be required that you apply for a visa in your home county or country of residence! This is the case for Iran (at the time of writing, though it might turn much easier in the near future) and for some African countries like both Congos.