What's Up with 1,500 Year Old Unknown Pyramids in Mexico?

These 1,500-year-old pyramids were built by native masons and are still standing strong thanks to the prickly pear cactus' sticky juice.

The stone formations in Cañada de La Virgen, a region in the central highlands of Mexico, about 30 miles outside of San Miguel de Allende, blend conspicuously into the dry, parched terrain much like modest mountain range. They appear to have been created by Nature. As you draw near to these structures, it becomes evident that they man-made; a knowledgeable mason's hand had been required to sculpt a staircase of exactly equal steps into the hard, dark stone. The other two pyramids, smaller and less well-preserved, also displayed a similarly evident human influence. The ancient structures were built by a long-gone culture.

Nineteen skeletons have been found at the site, including a female skeleton at the top of the House of the Thirteen Heavens (Credit: imagebroker/Alamy)