The Temple of Kukulcán at Chichén Itzá, about AD 900: a nine-tiered Maya step pyramid with a stair of 91 steps on each face, feathered serpents at their feet, and the small temple on top.
A 3D model of Chichén Itzá, built from photographs and drawings with my3dhouse. It is an interpretation of the building, not a survey of it.