Source : Webster's Revised Unabridged Dictionary (1913)

Alhambra \Al*ham"bra\, n. [Ultimately fr. Ar. al the + hamr[=a]
   red; i. e., the red (sc. house).]
   The palace of the Moorish kings at Granada.

Source : WordNet®

Alhambra
     n : a palace and fortress built in Granada by the Muslims in the
         Middle Ages