Just through the Sea Gate (also known as the Bab el Bahr and the Porte de France), begins the modern city, or Ville Nouvelle, transversed by the grand Avenue Bourguiba (considered by many to be the Tunisian Champs-Élysées), where the colonial-era buildings provide a clear contrast to smaller older structures. As the capital city of the country Tunis is the center of Tunisian commercial activity, as well as focus of political and administrative life in the country. The expansion of the Tunisian economy in the last decades is reflected in the booming development of the outer city where one can see clearly the social challenges brought about by rapid modernization in Tunisia.