I1: Dwellers of the Forbidden City

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Dwellers of the Forbidden City was David Cook's 1980 adventure mooted at the Origins World Fair tournament. It was published the following year as "S4" no wait "I1". Why they didn't carry on the S line with it... who knows, especially since Gygax retconned Caverns as WG3 anyway.

It's what got Cook permanently hired. Despite that the critics yawned at it at the time.

This is where TSR introduced the yuan-ti and the aboleth. Also the mongrelmanfolk and the tasloi, for what they are worth.

It's your Robert E. Howard romp through an exotic (read: Oriental) temple of snake men and eldritch anathema. The next edition later, Sean Reynolds would name this city: "Xuxulieto".

In 5e the city was heavily reworked and combined with another heavily reworked dungeon (S1: Tomb of Horrors) as well as a fair bit of hexcrawling and sold as the adventure Tomb of Annihilation.

Details

I1 has the player characters learning about major trade disruption from an unnamed jungle region and set off to learn what is going on. As they head south they are met by an unnamed chief of an unnamed tribe who also want to know what the deal with caravans is and why they have been going missing and ruining trade (oh, and his son is missing too apparently). The characters then set off through a thick jungle area and soon discover the Forbidden City.

Within the city proper there is really very little plot. Some monsters are raiding the caravans but they aren't the only ones in the city and most are basically indifferent to the outside world. That's not to say most of them are neutral or anything, most of them are evil, but they are more focused on dealing with the other factions in the city to let things such as caravans bother them.

That's about it. The PCs head off to kill some monsters, recover loot and maybe save some people. The draw to the adventure isn't so much the plot hook as the possibility for the DM and party to adapt and modify the Forbidden City as they wished (which most groups did since there really isn't much there).