text:  There are nine Twin @-@ Pyramid Complexes at Tikal , one of which was completely dismantled in ancient times and some others were partly destroyed . They vary in size but consist of two pyramids facing each other on an east – west axis . These pyramids are flat @-@ topped and have stairways on all four sides . A row of plain stelae is placed immediately to the west of the eastern pyramid and to the north of the pyramids , and lying roughly equidistant from them , there is usually a sculpted stela and altar pair . On the south side of these complexes there is a long vaulted building containing a single room with nine doorways . The entire complex was built at once and these complexes were built at 20 @-@ year ( or k 'atun ) intervals during the Late Classic . The first twin pyramid complex was built in the early 6th century in the East Plaza . It was once thought that these complexes were unique to Tikal but rare examples have now been found at other sites , such as Yaxha and <unk> , and they may reflect the extent of Tikal 's political dominance in the Late Classic . 
  