Arriving in Beijing, you refer to the latter part of your last clue. "You'll find it where it's forbidden." You know that can only mean what?

Although the Forbidden City was not built by the fall of the Mongolian Empire, the mysterious treasure hider must have found access to the enormous imperial palace. Building on the Forbidden City began in 1406, and its first occupants moved in around 1420. The 178-acre site has since been a dynastical center for five centuries.

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