The most interesting facts about Syria, from one of the oldest civilisations on Earth to one of the world’s most dangerous countries.

The most interesting facts about Equatorial Guinea, from one of the world’s wettest places to a corrupt dictator with a playboy son.

The most interesting facts about North Korea, from “three generations of punishment” to a metro system that doubles as a nuclear bunker.

The most interesting facts about South Korea, from a sex-themed park called Jeju Love Land to one of YouTube’s most-watched videos.

Ancient ruins, a tank graveyard and one of the oldest human skeletons, these are the most interesting facts about Eritrea.

We take a look at the world’s 21 countries that don’t have an army, from tiny island nations to states who abolished their militaries.