Papua New Guinea
The Independent State of Papua New Guinea is the third most known country in Oceania, after Australia and New Zealand. The country itself is the eastern part of the island of New Guinea, the western part being of Indonesia.
During World War I it was taken by Australia (from Germany). In the sequel it was a major battleground between Australian, American and Japanese troops. At the end of the war, north and south were united in a single country (until then were administered separately) administrated by Australia. They declared independence in 1975, but they’re still part of the Commonwealth.
The country is mostly rural and much unexplored, geographically and culturally, at the point that a lot of people think the country can be a surprise box of wildlife.
Despite the fact the country is so close to the equator, it actually snows in there.
The country is incredibly diverse, to the point there are more than 850 spoken languages in there. Almost all the population is Christian, but there are also animistic religions. Formerly used seashells as currency, something that can be quite weird to the rest of the world (you can still bribe someone with seashells, though).
Their flag has the Sothern Cross and a bird of paradise, a favorite among bird observers.