Madrid and Catalonia are popular tourist destinations in Spain, known for landmarks like La Sagrada Familia church and works of famous artists Picasso and Dali. Catalonia has its own culture and traditions like building human castles, and seeks independence although Spain wants to keep it as part of the country. Other notable Spanish locations mentioned include La Puerta del Sol in Madrid, La Alhambra in Granada, and the impressive Aqueduct of Segovia from Roman times.