some of the pyramids had many treasures of gold and silver that was buried with the Pharaoh when he or she died, most of the pyramids have now been plundered to nothingness.
The pyramids represented on the US bills are not the pyramids of GIZA as everyone seems to discuss and assume. They are in fact the pyramids of Kush, in what is now Sudan. These were built from around 500BC, by the Nubians who eventually became pharaohs of Upper and Lower Egypt.
Pyramids influenced new civilizations to build strong structures, and they were the basis of the constructions we have in now days based in geometrical shapes.
The pyramids can be preserved for future generations by exercising caution now. They will last long if there is limited access to them, and the number of people allowed inside the pyramids should be very small.
They are tombs of pharaohs, now they are tourist attractions.
stone
In 2008 there were 118 identified pyramids. Now it seems at least another 29 pyramid bases may have been found. It is hard to find some of these last pyramids as the quality of the materials was not the same as the more famous pyramids that are standing.
i do not now ask someone else
Most of the time they had used limestone to build the pyramids, but you can't really tell now because it's old and dried up.
Djoser Khufu Khafre Menkaure In 1842 Karl Richard Lepsius made a list of 67 pyramids, now about twice as many are known.
Guatemala
The pyramids were built in 1932 in Egypt by president Obama when he was still a president.He is now dead.