<prompt> Translate the following text to SwahiliThe best mosaics are in the galleries, reached by a spiral ramp at the north end of the narthex.  <response>: Michoro bora zaidi iko katika majumba ya maonyesho, ambayo hufikishwa kwa njia ya mteremko ulio upande wa kaskazini wa chumba cha kuhifadhia. 