Answer:
Visit El Prado Museum and the Palacio Real in Madrid, the Bilbao Guggenheim Museum, La Sagrada Familia church and Las Ramblas in Barcelona, El Catedral , El Archivo General de Indias and El Torre del Oro in Sevilla, El Alhambra n Granada, and El Coto Dona Ana in Huelva.
El Prado Museum in Madrid, La Sagrada Familia in Barcelona, the Cathedral of Sevilla, the Cordoba Mosque.
The Plaza del Toros also in Barcelona.
The country side in between main cities is beautiful.
North of Barcelona is a Monastery built on a mountain called Montserrat . Well worth a visit.