Who built the pyramids to the Egyptians?

Specialists suspect that these are traces of ancient civilization forgotten.
Could the ancient Egyptians to build their own giant pyramids and palaces? People who only read about these constructions in the history books, think: yes. But many of those who have been in this country, and wandered about, for example, through the valley of Giza, are skeptical. Too impressive these buildings, even on their construction, are expected to work of tens of thousands of slaves.
Version of Conan Doyle
The theory that the pyramids - it's material traces of a more ancient technologically advanced civilization that does not put forward today. For example, in 1929, "the father of Sherlock Holmes Sir Arthur Conan Doyle published a science fiction novel" Marakotova abyss ", the heroes who fall into a city - an island thousands of years ago he went down to the bottom of the Atlantic Ocean. When one examines the underwater structure, it observes that: "The columns, platforms and stairs of the building surpasses anything I've ever seen on earth. Most of the building looked like the remnants of the temple of Karnak in Luxor, Egypt, and, strange to say, jewelry, and half-erased inscription in the little things such as decorations and inscriptions of the great ruins near the Nile. "
According to Conan Doyle, by the way, who visited Egypt before writing this novel, all the local ancient structures were built by Atlanteans. A Doyle, according to his contemporaries, as well as his famous hero-detective, had a brilliant analytical abilities.