Metal spheres mined from South Africa about an inch or so in diameter, some etched with 3 parallel grooves around the equator. Incredibly they were dug from Precambrian rock of the Archeon period billion years old!
Stone sculpture depicting a Vimana, flying machines in ancient India b.), Many Sanskrit epics, which were written in India more than two millennia ago, contain references to mythical flying machines called vimanas.
No Mortar, the precision fit binds them.No doubt one of the most impressive ancient sites. Huge irregular stones carved and fit together so perfectly you can't slip a knife blade in between them, Incan architecture, Cuzco.