Yeah, GURPS character creation can take quite a lot of time, but once the character is done it flows very smoothly, so that doesn't bother me. But GMs need to create NPCs all the time, and the speed of character creation is very, very important.
I particularly like the monastery - we need more places like this as adventure locations!

Another candidate: The Centralia Mine Fire, an underground coal seam fire that has been going for sixty years, and which could continue to burn for 250 further years!
I wonder how dwarves or other subterranean civilizations would deal with something like this?
Another one: The "Bergpark Wilhelmshöhe" in Kassel, Germany.

This is a masterpiece of Baroque landscape architecture, and the Hessian landgrave at the time was only able to afford it because his father sold of Hessian subjects to the British so that they could put a stop to those pesky rebels in the North American colonies. The park is built across a hill slope (and covers an elevation change of more than 250 meters). Its highlights are the "Wasserspiele" ("Water Plays"). On every Sunday and Wednesday during the warmer seasons, water is released from a vast cistern at the top, located beneath a giant bronze statue of Hercules. Over the course of 75 minutes, this water flows down a series of artificial waterfalls and channels until it powers a giant fountain close to the bottom of the park.
Beyond that, the park has all sorts of other attractions - a fake ruined castle, a fake ruined Roman aqueduct, and a series of miniature temples to assorted Roman gods. This park makes a perfect setting for all sorts of cinematic adventures and/or occult weirdness!
I took it from Wikipedia, which says that it is from the Monteverde Cloud Forest Reserve in Costa Rica.
Truly, a scenario to warm the shriveled heart of any veteran GM.
From what I gather, there were actually fewer accidents under this system than with the ladders.
There's even one still in operation, at Sankt Andreasberg where it's used for maintenance at the local hydroelectric power plant installed in the former mine shaft.
I wish that someone had warned me that one of the most important aspects for picking a system to run is how difficult or complex it is to create NPCs or monsters.
I ran D&D 3.X for a time, which... wasn't great for that.
Then I ran Exalted 1E and 2E, which were worse.
These days I mostly run D&D 5E, which is (a) vastly simpler when it comes to NPC prep, and (b) has so many stat blocks in both official and unofficial sources that I rarely need to come up with something custom.
A honorable mention goes out to GURPS, which is actually pretty easy to run for once you know what you are doing - first you need to keep in mind that "character points" are mostly for player characters, and can be ignored for NPCs for the most part. Then you also need to keep in mind not do overdo it with defensive stats, or else combat will get bogged down and boring.
The author isn't wrong, and such issues are worth thinking about when either running campaigns or doing #ttrpg worldbuilding. At the very least, dungeon inhabitants tend to be people or creature who live in this marginal environment because they were pushed away from more fertile regions (such as the fertile surface lands typically inhabited by player character ancestries).
Even if you do use some of this default structure, it's worth introducing some scenes and elements that could make the PCs (and the players) think: "Hold on, are we actually the good guys here?"
I rarely have buyer's regret for TTRPG products, but Carcosa ranks high on that list. The "Sorcerous Rituals" section is maybe worst - do we really need a detailed list of how sorcerers sacrifice humans to work their magic? Not to mention one ritual ("Consign to the Lightless Lake") where the sorcerer actually rapes his victim.
I will never buy anything from Geoffrey McKinney again.
Done. Thanks for the suggestion!
Pathfinder 1E or 2E?
I don't have much practical experience with the latter, but it did move away from the notion that NPCs must be created with the same system as PCs.