Gate of Heavenly Peace
From the Super Mario Wiki, the Mario encyclopedia
The Gate of Heavenly Peace is an item in every release of Mario is Missing!. It is the entryway to the Imperial City and the Forbidden City of Beijing. A group of Koopa Troopas steal it in its entirety while they are storming Beijing, and Luigi takes it back after grabbing it from the single Koopa Troopa that was carrying it around. He then shows it to Beijing's inhabitants and asks them questions about it, with all of them telling him what it is while providing additional facts, such as how it was "built in the 4th century" (which is completely false). Eventually, Luigi learns enough to return the gate to its proper place through the Forbidden City's information booth, receiving a cash reward of $1750, as well as a bonus of $2800 if the gate is returned before the other stolen items.