Constructed roughly 4,500 years ago, these massive relics of the Old Kingdom era have survived seemingly everything.

Production of the first pyramid was started by Pharaoh Khufu around 2550 B.C.

The third temple was built in 2490 B.C.

Secrets of Giza

Credit: Nick Brundle/Getty Images

It is said that these stunning structures hold the secrets of the ancient Egyptian pharaohs.

Here are some interesting facts about these ancient and mysterious marvels.

This structure has surviveda lot.

Illustration of the Great Pyramid of Gize with written facts that are also stated in the text of the article

Lara Antal/Travel+Leisure

The Great Pyramid of Giza was the tallest man-made structure on earth for 3,871 years.

Today, the Burj Khalifa in Dubai is theworld’s tallest man-made structure, standing at 2,722 feet.

Menkaure’s pyramid suffered a deep gash but is otherwise intact to this day.

While it seems possible, this theory has received a good amount of criticism and rebuttal.

Want to read about more secrets?

Check out15 Disney World Secrets You’ve Never Heard Before.