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Evidence was also found that the structure was built in stages, thousands of years apart. The older parts of the structure were built somewhere between 25,000 and 14,000 years ago, making it the oldest known pyramid in the world.
The builders first carved the figures out of cooled lava on top of an extinct volcano. A few thousand years later, between 7900 and 6100 BC, a layer of bricks and stone columns was added. Some time later, another group of builders added a layer of earth to part of the hill, covering up some of the earlier work. Then, somewhere between 2000 and 1100 BC, more topsoil, stone terraces and other features were added.
