Actually that's somehow difficult to say exactly, but here are some countries.
Some of them although heard, many times it's difficult to show on map. A list with some countries with their maps and the positions in the World.
1. Nauru Only 200 tourists visited Nauru in 2011.
2. Kyrgyzstan
This Asian country is trapped between mountain ranges, so horseback riding is a big deal... and so are traditional horseback riding games
3. Brunei
Nobody pays taxes in this little mosque-covered nation on the island of Borneo. Each year, the sultan orders a ship full of buffalo, goats and cattle for the religious festival of Qurban (Eid) .
4. Kiribati
If you clumped together all 33 of Kiribati’s teensy islands, they’d be about the size of New York City. But the teensy islands are so spread out in the Pacific Ocean that it takes six hours to fly from the first one to the last.
5. Djibouti
This desert country joined the United Nations in 1970 after wriggling free of the French.
6. Malta
This little island off the coast of Sicily belonged to Phoenecians, Romans, Arabs and Napoleon before winning independence in the 1960s. Maltese Language is a branch of Arabic that is written in Latin script.
7. Mayotte
The people of this French island are especially enthusiastic about their turtles. Apparently, thousands lay eggs upon the coastline each night. The nation’s website urges turtle hunters to avoid using flashlights, as the female turtle’s “body cavity will not widen” if you shine light on her.
Reference: Huffington Post Bet You Haven't Been Here
8. Kosovo - Europe's youngest country!
111 out of 193 United Nations (UN) Member States (57.51%) have already recognized Kosovo as an independent state.
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Update, thanks to Ram Kaousik:
9. Burkina Faso
It is an African country. The capital is Ouagadougou. The reason behind its negative popularity is because, it is economically backward country and has very limited connectivity to outside world. The only International Airport is in the Capital. There are frequently flights available to only West African cities and Paris.