07 Oct Blog, Italian Vacations, Private Tours, Undiscovered Italy Exclusive tours of Italy: the Most Serene Republic of San Marino The oldest constitutional republic in the world, the Most Serene Republic of San Marino managed to hold on to its independence since the fourth century.... | Tagged Monte Titano, Most Serene Republic of San Marino, Museums of Torture and Weaponry, Oldest Constitutional Republic, Palazzo Pubblico, Smallest European Country, State Museum