Why is Spain's capitol building the most famous building in Spain?

Answer 1

The Spanish Parliament has two houses. The upper house is the Senado (Senate) and the lower house is El Congreso de los Diputados.

The Senado is housed in the Palacio del Senado and the Congreso de los Diputados is housed in Palacio del Congreso de los Diputados.

Answer 2

Spain does not have a Capitol Building.

Probably the most famous locations in Spain are El Real Monasterio de El Escorial ( a Palace and a Monastery) in San Lorenzo about 45 kilometers outside Madrid, the Alhambra Palace and Fortress in Granada, the Sagrada Familia Basilica in Barcelona, Santiago de Compostela Cathedral, and Catedral de Santa María de la Sede in Sevilla.

All have been designated World Heritage Sites by UNESCO.