They are reached by a large ceremonial stairway that descends from the courtyard .
Are connected to each other by a long narrow corridor with a high vaulted ceiling , which receives light from a series of openings to the courtyard above .
They are reached by a large ceremonial stairway that descends from the courtyard , and are connected to each other by a long narrow corridor with a high vaulted ceiling , which receives light from a series of openings to the courtyard above .