Why are the pyramids in Egypt

Why are the pyramids in Egypt somewhat similar to other ancient pyramids that have now been discovered all over the world

This is one of the truly great mysteries of the ancient world.  You see, techniques were used in the construction of some of these ancient pyramids that mankind is only just now able to understand. massive pyramids that have been found in South America. But very few people know about the pyramids that have now been discovered in China, Bosnia, the United States, Europe and Russia. The truth is that hundreds of giant ancient pyramids have now been discovered all over the world.
The Pyramids...Was the great flood that every ancient culture has in their history,be the demise of the pyramid builders ? Yes. Notice the similar shapes and how the ones in Asia and central America are almost identical. The pyramids date back to before 3000 BC.
There are more than 16 pyramids spread over Greece. The oldest one is the pyramid of Hellinikon.The existence of ancient pyramids in Greece, some of which date before those found in Egypt, is now being discovered and investigated. At Hellenikon and Ligourio west of Athens in the Argolid region, are two limestone pyramids that are stylistically very much like those at Giza near Cairo. The big difference is size; the Greek pyramids are only the size of a large room compared to the Great Pyramid's height (with capstone) of almost 500 feet.
Pyramids are thousands of mile apart because The continents before the flood were all one land mass.The continents moved quickly after the flood seperating the pyramids thousands of miles apart, and any history and records of them was destroyed in the flood.