La Coruna is the largest city in Spain’s Galicia region and among the country’s busiest ports. Today the city’s significant expansion is evident in its three distinct quarters: the Ciudad (City), and town center located along the isthmus; the business and commercial center with wide avenues and shopping streets; and the Ensanche to the South, built up with industry. La Coruna’s beautiful main square, Plaza Maria Pita, has many buildings in the old section which feature characteristic glazed facades, which have earned La Coruna the name City of Crystals. Santiago de Compostela is located only 37 miles from La Coruna. The City is the original town with narrow, cobbled streets and quaint squares. Avenida de la Marina, running parallel to the waterfront, is lined by typical tall houses with glazed balconies at every floor. Mendez Nunez Gardens lie between the harbor and Los Cantones in a bustling quarter of the city. Once used as a prison, San Anton Castle now houses the Military and Archaeological Museum. The Roman lighthouse Hercules Tower is said to be the oldest in Europe.