The Great Pyramid of Giza is 481 feet tall and is the largest of the three pyramids built by the ancient Egyptians. This is one of the most famous pyramids in the world and it has been on the list of UNESCO World Heritage Sites since 1979. It is the tallest structure in Egypt. Construction on the Great Pyramid of Giza took 20 years to complete, from 2560 to 2589 BC. It is thought that over 2, 300, 000 blocks of stone were used to build it.