Speaking of historically significant feats, I don’t think that any construction is more impressive than the construction of the Great Pyramid of Giza. This pyramid is the last remaining survivor among the original ancient seven wonders of the world. This pyramid is the largest of the three pyramids in the Giza pyramid complex, and at 481 feet, it stood as the largest man-made structure in the world for literally thousands of years. Although people today now know this pyramid as looking sort of like a giant staircase, it was originally covered in stones that gave it a smooth surface. Historians suspect that the Great Pyramid of Giza was originally made as a tomb. It is estimated that the pyramid was constructed sometime between 2580 BC and 2560 BC, as it was constructed under fourth dynasty Pharaoh Khufu. The details behind the construction of this pyramid are still a mystery, but most people believe that it was either made by an army of slaves or an army of skilled laborers. Without a doubt, the sheer scale of this achievement is the most impressive in the world.