Monaco

Monaco, officially the Principality of Monaco is a sovereign city state on the French Riviera. Bordered on three sides by its neighbor, France, and its center is about 16 km from Italy. Area of 1.98 km 2 and a population of 35 986 as of the year 2011 and therefore is the most densely populated country in the world.
Principality of Monaco is governed by a form of constitutional monarchy, where Prince Albert II head of state. The rule of the Grimaldi of Monaco since 1297 except for short periods of time. Has been formally recognized the sovereignty of the State under a treaty between France and Monaco in 1861.