Why was building the pyramids impressive?

The Great Pyramids are undoubtedly impressive the perfectly constructed stone structures were built 4,500 years ago and the tallest reaches 147 meters, towering high above the flat sands of the Giza plateau in Egypt.

Also the fact that each pyramid contains around 2 million stones, each weighing between 1.5 and 3 tonnes, and was constructed in a time when the Egyptians didn’t have wheels or steel, and the only metal available was copper and copper alloy.