Inside the pyramid is a pyramid
This newly discovered pyramid, reaching 33 feet tall, may be up to 1,500 years old and appears to have a staircase and an altar at its peak. It`s also slightly out of alignment with the other two pyramids, which "may indicate that there are other buildings hidden at the same level," reports Deutsche Welle. As for why the Mayans built over it, the BBC cites two possibilities: a transfer of leadership or because it was simply in bad shape. CBS News reports the discovery was made using a non-invasive electrical imaging technique called 3D Electrical Tomography, and says no excavation plans have been announced. (This Mexican "mountain" is actually a stack of six pyramids or more.)