Built in 1920, it houses the Academies of Salvadoran History and the Spanish Language and isn't open to the public. But it's worth an admiring once-over from outside.
A handsome and unusual example of Art Nouveau.
If you happen to find yourself down amid the government buildings along Alameda Juan Pablo II, the handsome yellow and white structure at the corner of Ninth Avenue is worth a stop and a look. The Casa de las Academias (also known as the Casa Dueñas) is notable for its Art Deco style. Built in 1920 by the wealthy Palomo Dueñas family (but never inhabited by any of its members), it ended up hosting diplomats (such as the Mexican embassy), dignitaries (Robert Kennedy, Richard Nixon), famous visitors (Clark Gable, Tony Curtis, Tyrone Power), and ministries (Labor and Education). Today it houses the Salvadoran Academies of History and of the Spanish Language (hence the moniker "House of Academies").