A specific, widely circulated video claim (particularly active on TikTok from 2023 onward) argues that the Great Wall of China's defensive features β crenellations, arrow slits, the taller, more fortified side of the wall β face into China rather than outward toward the historical direction of nomadic invasion. If true, the argument goes, this would mean the wall was built to keep something contained within China, or to defend against a threat originating from the south, contradicting the standard account of a wall built to repel northern steppe invaders.
This is a genuinely checkable claim β not a matter of interpretation, but a physical question about which direction a specific, still-standing structure actually faces.