Roughly the size of Kentucky, diminutive Iceland nevertheless captivates with its lunar-like surface, volcanic landscape, glaciers, waterfalls and hot springs. Treasures abound everywhere you look, provided you have the gusto to rent a car and venture outside of the country’s admittedly charming capital city Reykjavik. The best way to take in all the sights is via a circular loop that connects most of the inhabited parts of the island. Here is the best of Iceland’s Ring Road. Hint: Get a 4WD vehicle. Also: Your three…