lintel 25, structure 23
maya, 725 CE, limestone
structure 33, yaxchilan
maya, 725 CE, limestone
structure 40 at yaxchilan
maya, 725 CE, limestone
great serpent mound
mississippian culture, c 1070 CE, earthwork/effigy mound
templo mayor
mexica (aztec), 1375-1520 CE, stone