Cádiz, the oldest continuously inhabited city in Spain and one of the oldest in western Europe, has been a principal home port of the Spanish Navy since the accession of the Spanish Bourbons in the 18th century. The city is a member of the Most Ancient European Towns Network. It is also the site of the University of Cádiz.Despite its unique site—on a narrow slice of land surrounded by the sea‚ Cádiz is, in most respects, a typically Andalusian city with a wealth of attractive vistas and well-preserved historical landmarks. The older part of Cádiz within the remnants of the city walls is commonly referred to as the Old Town (Spanish: Casco Antiguo). It is characterized by the antiquity of its various quarters (barrios), among them El Pópulo, La Viña, and Santa María, which present a marked contrast to the newer areas of town. While the Old City's street plan consists of narrow winding alleys connecting large plazas, newer areas of Cádiz typically have wide avenues and more modern buildings. In addition, the city is dotted with numerous parks where exotic plants flourish, including giant trees supposedly brought to Spain by Columbus from the New World.