UNESCO proclaimed Nice a World Heritage Site in 2021. The city has the second largest hotel capacity in the country, and it is the second most visited metropolis in Metropolitan France, receiving four million tourists every year. It also has the third busiest airport in France, after the two main Parisian ones. It is the historical capital city of the County of Nice. Located on the French Riviera, the southeastern coast of France on the Mediterranean Sea, at the foot of the French Alps, Nice is the second-largest French city on the Mediterranean coast and second-largest city in the Provence-Alpes-Côte d'Azur region after Marseille. Nice is approximately 13 kilometres (8 mi) from the principality of Monaco and 30 kilometres (19 mi) from the French–Italian border. Nice's airport serves as a gateway to the region.