Everybody knows that secrets and intrigue are the building blocks of any great mystery.

But what about when the building blocks themselves are the real mystery at hand?

From secret chambers inside famous monuments to an ancient mega pyramid that no one can find,

grab your chisels as we chip away at some of the most curious architectural mysteries that have baffled even the smartest historians.

You're listening. You're listening.

You're be amazed.

For over 4,000 years, architects, historians, and beyond have marveled at the great Sphinx of Giza. While most of us are preoccupied with the statue's exterior appearance, archaeologists have been investigating some tantalizing clues, hinting that the Sphinx sits on top of an ancient underground network.

Usually hidden from the view of onlookers, a small hole near the Sphinx's tail can be found.

This, some theorists have suggested, may be connected to an underground city of chambers at interconnecting tunnels below.

There are several shafts and holes dotted around the statue.

Well, all lead to dead ends and many are estimated to have been carved by treasure hunters after the sphinx's construction.

There are plenty of theories as to what may lie within or further beneath the Sphinx.

Legend has it that there is a maze below the Sphinx that leads to the mysterious Hall of Records,

an ancient library that is said to house essential knowledge of mathematics, medicine, and beyond.

In other words, the answers to just how advanced the ancient Egyptians really were.

However, there is no meaningful evidence for such a place ever having existed.

Skeptics argue that the area under the Sphinx would be a terrible place for any kind of library, especially since it's prone to groundwater flooding.

While it remains unclear exactly what's down there, who knows?

Maybe the ancient Egyptians are still managing to hide secrets from us in the modern world,

in a pyramid scheme of secrets, if you will.

The mere mention of the word pyramid is sure to conjure images of those in Egypt, but what

if I told you that China may be keeping a few enormous ancient pyramids of their own under wraps?

...