One of the most impressive decorative elements used in the Alhambra is the mocarabe vault(Honeycomb vaulting in the Hall of the Abencerrajes), formed by little cells or alveoluses placed one on top of the other one and which may be admired in the Hall of the Abencerrajes (Sala de los Abencerrajes) and the Hall of the Two Sisters (Sala de las Dos Hermanas).