Yunnanyi, China

The airport is the main point of entry and exit in this remote county, with a population of just 93,671. Throughout World War II, this airfield was a vital logistics hub for the Allied forces, shuttling in supplies and equipment. However, the glory days are long gone - the bureaucracy surrounding the former military airport is a persistent headache for anyone trying to get in or out.

The climate is harsh, with the airport perched high in the mountains of western Yunnan. And with the airfield's military history, safety may be a concern for the risk-averse. This is not the place for the faint of heart - Yunnanyi is for seasoned travelers only.