 even better than the Great Pyramid of Giza, better than Tutankhamun's tomb. I think obelisks just blow me away. Now, an obelisk is a single piece of stone. They're always made out of granite. They're often about 100 feet tall, and they weigh about 350 tons. Okay, so it's a single piece of stone, 350 tons, 100 feet long, and we still don't know how they erected them.