The Trans-Siberian Railway is known around the world for its impressive length, but many don't know that they can go further and enter one of the most dangerous countries on Earth

The world's longest direct train journey takes eight days to reach its destination – and crosses into one of the world's most secretive countries. Since June, direct passenger trains have been running from the Russian capital of Moscow all the way to North Korea's Pyongyang.

Kim Jong-un's hermit kingdom remains one of the most secretive – and feared – nations on Earth, with the tyrant's iron fist seeing residents executed for the simple act of watching foreign TV .

That's a staggering journey of 6,213 miles and makes it by far the longest train journey on Earth, according to the Guinness World Records .

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