Kalmar "babban birnin Spain" yawanci tana nufin babban birnin Spain, wato Madrid. A cikin wannan mahallin, "babban birni" yana nufin babban birni ko kujerar mulkin ƙasa. Madrid ba kawai babban birni ba ne amma kuma birni mafi girma a Spain, wanda aka sani da ɗimbin tarihi, al'adu masu fa'ida, da alamun gine-gine.
