If you dropped the Pyramids of Giza into the the deepest part of Lake Erie.... You would still see half of the Pyramids.

Deepest Part of Lake Erie is around 210 feet(64m) while the Pyramid of Khufu( Tallest out of the Pyramids of Giza) is 480 feet(145m). Thats how fucking tall the Pyramids were and they are 4500 years old.

Fun fact: The Pyramids of Giza held the tallest man-made structure for around 3500 years!