Barrow, Alaska
Credit: Danita Delimont / Getty Images

Located 320 miles north of the Arctic Circle, Barrow is America's northernmost city and has been inhabited since at least 500 A.D. That's pretty impressive, considering the inhospitable climate. The average temperature is just over 9 F and the city is below freezing about 90 percent of the year. There are also no roads to the city, meaning visitors and residents have to get in and out by plane. On the plus side, Barrow is a great place to get a good look at polar bears.