4
Eritrea


GettyImages
Located in Central Asia and surrounded by ex-USSR countries and Iran, Turkmenistan has had its fair share of bad experiences with tourists.
The US visitor ban is probably a remnant of the old Soviet regime. The filthy American dollars aren't wanted by most of the "stan" countries anyway.
But if there is an absolute need to gain entry, a letter of invitation straight from the Turkmenistani government will be required, which, realistically speaking, is highly unlikely.
Obtaining a transit visa makes things a bit easier, but with that, one can only be permitted to stay inside Turkmenistan for three days.
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