Pyramids

The question of how the pyramids were built has not received a wholly satisfactory answer.
The most plausible one is that the Egyptians employed a sloping and encircling embankment
of brick, earth, and sand, which was increased in height and in length as the pyramid rose;
stone blocks were hauled up the ramp by means of sledges, rollers, and levers. According
to the ancient Greek historian Herodotus..