Windenburg is a Sims 4 city, from the expansion pack, The Sims4: Get Together and it is the first place that is referenced in my SimLit, Friends of Foes. In the tale, the city is where the Royal Palace is.
Royal family gathers in the palace living room in Windenburg, 2007
The palace was first built in 1978, when Queen Brynhildr and King Roland left the woods where they'd been living and used the forced labour of local builders to erect their castle. There's an urban legend in Windenburg that the Royal family arrived here by portal from the ancient past, which was why some of their customs and traditions were originally, and still are to some extent, odd.
The Bluffs is a secret place that few know about. It was originally a base camp for the intelligence agency, The Goodie Two Shoes. The only reason why the Evil Geniuses know about it is because of Evil Genius, Oak Cruz, who was a mole in The Goodie Two Shoes, during the intelligence war in 1977. Ever since then, it has been a secret hideout for Evil Genius teenagers, who camp there during the summer breaks.