This excerpt is describing an abandoned modern facility from the perspective of a medieval civilization thousands of years following an apocalypse. Can you guess what type of facility it was based on the context clues? Hint, it is located somewhere in the present southeastern United States, specifically around Florida and Alabama. "The Tomb of the Three Tyrants is difficult to explore, being in the hilly countryside inhabited by the uncivilized and sometimes violent northern tribes. Several expeditions have been made, however. The Tomb is not surrounded by many Prehistoric artifacts, though one Prehistoric road leads up to it. It is composed of a large circular stone slab, 100 paces in diameter. There are three stone slabs upon the base slab which, when viewed from above, would look like three triangles emanating from a central point. It is believed that these three slabs cover the enormous tombs of the three tyrants, buried here in a place of dishonor. The stones all bear inscriptions, still visible even millennia later. Many of these inscriptions are in various Prehistoric scripts, and are thus unreadable. However, many more inscriptions are pictographic. These diagrams show simple human shapes in a variety of positions. The diagrams seem to tell a story. In many, there is the symbol of the three tyrants (three triangles emanating from a central point with a circle around them). In diagrams with those symbols, people are always shown dying. This is believed to show that the three tyrants killed their subjects mercilessly, though the method of execution is never shown except for dots seeming to enter the bodies of the tyrants' victims. Other diagrams show anatomical representations of the insides of people, some without damage, and others with damage when shown with the symbol of the three tyrants. The origin of the damage is still unknown, unfortunately, but these three tyrants must have killed their victims in some horrifying way, according to modern scholars. Expeditions have been sent to try to dig into the tomb to uncover any wealth buried within, but between the thickness of the stone and the attacks by northern tribesmen, not much success has been had."

Holy shit you were so close! It is related to nuclear power, but it is not a nuclear power plant. I should to tell you that it is not a real place in our world. It is a fictional location creative exclusively for the narrative. You are right that it is related to nuclear power. Try again.

No, it is not that either. It is a place meant to store something. There is a reason it is called a "tomb".

Yes that is correct. Now let's try this one. "The Tower of Arrogance is a skeletal structure lying on its side two days ride southwest of Fortress Eacon, near the Sea of Storms. Some parts of the Tower show signs of rust, indicating it may have once been submerged in water. The structure is thought to be a tower which was knocked over by some vengeful god in Prehistoric times. The tower itself is actually made from four smaller towers and support bracings between them. The tower is over four hundred paces long and made from what appears to be an advanced steel-like alloy. The surrounding area is poor for farming due to the constant leakage of dark oils and pitch from underground to the surface."

Yes that is correct. "The Silver Virility is a long, phallic shaped construct of Prehistory, found a half-day's ride from Dhar, half-buried in the grassland near a river. It is made from an unknown and incredibly tough metal (nicknamed "titanstone" by Ictorians). There are some holes and fissures through which people can enter the Silver Virility. Inside, there are many decayed artifacts of Prehistory, all of unknown purpose. Clearly, however, it was designed such that people could move about inside the Silver Virility. Altogether, the Silver Virility is over 200 paces long and 20 paces wide. Followers of the old Lone God religion in Jyllyn believed it to be the severed phallus of some impostor god, or possibly the devil. To this day, it is taken to be a sign of fertility. Couples seeking children will sometimes visit the Silver Virility, walk around it (the inside is pitch-dark and difficult to enter), and spend the night in one of the many inns in the vicinity."

What contemporary structure is it? I will give you a hint, it is not a building, it is a vessel, a very important vessel that controls the fate of the world.

Yes that is correct. How about this one? "The Devil's Prison is a half-day's ride north of Wean. The Prison is two great stone slabs, each a thousand paces long (exactly north-south) and two hundred paces wide. The two slabs are 4,000 paces apart, very near high Mounds. The slabs are incredibly thick, ten heights of a man. Great notches go through their centers, making vast horizontal caverns. They are each littered with jagged pieces of metal, making it difficult and dangerous to explore. There is almost no Prehistoric writing anywhere nearby, giving the area a quiet, desolate feel. Prehistoric roads both encircle and point to each slab. The Priests of Wean believe some sort of demon (or demons) is trapped underneath the slabs, imprisoned there in some Prehistoric battle. The entire site is guarded by soldiers of Wean to ensure no one tries to break through the stone door to the prison. To even attempt such would be a titanic industrial operation, so the utility of the guards is questionable at best."

It is not a nuclear missile facility, but it does play a similar role. It is technically a military site.