The Sierra Madre Plaza. The casino itself isn't that scary to me, but the dark, old, cloud filled town filled with the poor remaining husks of those innocent workers hits me hard. Oh and the collar is an additional factor. *Beep, Beep, Beep...* *Cries*

As someone who would be the Shaggy Rogers in an investigation team with how badly I jump over surprises, Vault 22 psyched me out hard. Going through there in D.U.S.T. was doubly worse - I was expecting the mod's author to have inserted something even worse than Spore Carriers somehow, and my imagination went crazy trying to cook up something worse.

Although I do Agree with a majority of people when it comes to Vault 22 (seriously all it took was that sing outside that said the plants kill to have my on edge the entire time I was in that place.) for me it has to be Lone Wolf Radio. It's just so...ominous and quiet the whole time I'm there I'm expecting something to happen or someone to attack me but it never comes. That place really creeps me out because its so empty nothings there no ones there just an empty trailer with some radio equipment.

Vault 22 using an ENB which makes the environment darker. Those spore carriers scared the crap out of me the first time I ran through.

Vault 22 without a doubt, creepy as hell

Yes indeed, vault 22 creeped me out, especially while reading the logs off the terminal in the clinic.

Vault 22 for sure creeped me out the most as well.

Spoiler:

Hell's Motel....because how did it become so irradiated? Why is it ghoul city there?

Its so creepy especially with a ENB in the dark. The glow of the radiation

Also to top it. With the Beyond the Border mod there is this insane asylum that scared the hell out of me and i regretted going in.

In Dead Money was a labyrinth like place where you must find Christine and there was so many holograms of Vera Keyes and every of them said that same dialog about Sinclair. That was probably creepiest thing in the game for me.

Has to be vault 22 as it is creepy going into a overrun place full of plants and plant people

Oh man the Sierra Madre scared me too many times, mostly when I had no ammo or companion and they just start to swarm at me.

Besides the obvious Vault 22 and Sierra Madre, how about the Courier's Mile in Lonesome Road? Highly radioactive bombed-out ruins with Marked Men and Deathclaws popping out of nowhere and rendering your ability to sense them on the compass useless. There's also the highway with those freaking Tunnelers that instakilled a deathclaw right in front of you.

Vault 11 is creepy af... Because the story and that note/tape you found with the corpses and all... One of the scariest with that "jumpscare". And Sierra Madre... Uff.

Fear is subjective. Sense of isolation, tight corridors, ghouls, centaurs or other monsters never really scared me. What gets to me is a little different. Y-17 trauma override harness. Though I could crack some cheesy joke about skeletons (how fitting, Halloween's close) I'm not creative enough so you're going to have to excuse me. I don't know what it exactly is about these things, but they've made me feel not quite literal fear, but anxiety. Maybe it's the idea of not being able to control yourself and dying slowly due to dehydration and/or starvation, only to have the suit control your body past your death.

By "TDSpiral" on Deviantart. I felt it captivated pretty well how grim the concept can be:

So, wherever these things hang around (in Old World Blues, obviously), i'll consider creepy just due to their presence.

Vault 11.

Just the fact that those people were lied to, Vault-tec was known for it's cruel social experiments and tests, but that one really takes the cake..

It makes you wonder just how many people were sacrificed, because they were lied to by Vault-tec..

Definately has to be the Sierra Madre. Something to do with the atmosphere and the ghost people (mostly the ghost people). just people trapped in defunct suits while being heavily deformed by the cloud and radiation seeping through unable to do anything bothers me a little.

Adding to the fact that NPCs tell you to dismember them in order to kill them, they shamble around worse then ferals, oddly enough they're smarter than ferals with being able to craft decent weapons on their own, they don't talk and only mutter incredibly ghastly noises, and often gather in places like sewers and possibly the church.

I'm also getting the feeling that's not all that there is to them. the cloud mostly just kills now, i haven't seen it mutate people an any way. supposedly people often get dragged away by them and turned into one of them somehow. Witch i think harkons to the rarely visited "unnatural" route the way the dunwitch building, and point lookout went in FO3. Perhaps some unholy ritual takes place in order to alter them.

Vault 22 or the Repconn Test Site basement, I usually just go in, ~, killall, done.

I thought of the Sierra Madre was pretty scary.

Repconn Basement and Sierra Madre. I'm constantly pressing the VATS button when I'm there.

Lone Wolf Radio, the place creeps me out, especially with dark nights mods installed.