Nauru

This island is so small that you can easily run – or walk – around the whole island. (Besides, who doesn't want to say they've run around a country?) While Nauru is trying hard to attract more travelers, there isn't much to do here. There are very few restaurants and bars, and fresh drinking water is especially precious. Nature, however, abounds. With a population of only 19,000 and only 200 visitors per year, the beaches are practically untouched. Coral reefs surround the island and make for great diving. Meanwhile, the center of the island also has an old phosphate mine that visitors can explore. Only one airline flies in and out of Nauru, called Nauru Airlines.

Read more: 4 Totally Unique Scuba Diving Destinations