The lore goes that the pyramid is 4x the size of Giza, and rests underground. It was discovered during the Cold War when American govt was setting up the White Alice Communications Systems and the Distant Early Warning Lines in the arctic of Alaska, for its open space. supposedly they picked up EM feedback underground so strong, they thought it might be soviet spies in a small bunker. But they found a pyramid producing enough electromagnetic energy to power the entire continent of North America, if it could be properly harnessed. Presumably, it was built above ground many thousands of years ago, and eventually made its way underground from the natural shifts and sediments of the earth.
for my SCP story, I would do a bit of a period piece. discussing how the US government first found this in the '60's, and handed it over to the Foundation for further study and containment once government personnel begin exhibiting signs of schizophrenia, mutilation and death, all in extreme cases surrounded the pyramid. in an attempt to harness the reusable energy, they end up waking up a "sleeping deity" so to speak.
Most personnel are fine, and just experience an ominous presence. But some go absolutely mad. And some begin reporting that their hallucinations are guided, they all fit within certain patterns. They all see a woman in black (the Black Queen, perhaps?), and this will be the SCP version of the Egyptian Mother of the Mysteries, Isis/Aset. the subjects that have entered her temple are un-initiated, ignorant, and unclean in her eyes and she seeks to protect her secrets.
The Foundation will come in and relieve the US govt of its pyramid duties, and the Foundation will be FAR more equipped to deal with this, but even they run into some roadblocks. They try to bring in high ranking personnel to begin meditating within this pyramid, trying to speak to the EM radio-wave Goddess that resides in the structure. but these men eventually go mad too.
Oh and as for reasons needed to contain this pyramid, the EM static (the body of the goddess, essentially) is growing slowly in its output, and while the pyramid is contained underground, the Foundation are concerned that the Goddess's reach is growing stronger and covering more ground indefinitely.
That's a very rough, basic outline. What do you all think?
Donnie: Why are you wearing that stupid bunny suit?
Frank: Why are you wearing that stupid man suit…?