That assumes a lot unless he knew Harry was coming back. And according to portal mechanics as described in Skin Game that might change with The Brighter Future Society being there instead of Dresden.

Not necessarily, at the very least it is likely one of the thinner spots in a town who's veil has been Thinning for years. 

I dont really know how much (if any) of the defenses that Lea put on the NN side would remain; normally Id say they very much would Not, but I dont really get how she was able to do make the Garden in the first place without similarly changing it's Real World location and given how Edinburough's defenses seem to have remained through a change of ownership (fae to wizard) I think it's possible the location could have been changed by a Wizard's long-term residence enough to have some kind of tactical advantage aside from just the location it connects to on the NN side. 

Since Harry is good at making magical items, for his age, wouldn't it be interesting for him to spend some time with Klaus the toymaker. I would like to see snakes in a can but with real snakes.

He honestly, nerdily loves to design and make his little magic gadgets, I would really love to see him actually study with any one of the masters of that Craft.  I want o see Klaus under any circumstances, but if Harry had to learn Craft-Magic I think it would be more (sadistically) entertaining if he were to study with Mai instead... 

Maybe, but that bugs me. Intellectus is supposed to be more absolute than that, I think. Even if Harry's limited version isn't, I mean... how far does the effect extend? If a non-human being with full Intellectus tells an adult human about them, does the human just instantly forget about it?

Probably would forget, unless they had some other way to /make/ the memory stick.  And Id assume harry could still spot one with his Sight if he actually knew what he was looking for, though a lot of the time he actively ignores most of what his Sight shows him in basic self-defense.   Alfred's Intellects has always been the most limited example of it from day one, and is particularly focused on his Inmates, which I think is a lot of why he was never very practiced at recognizing mortals.  But if one of the Creepers were to get locked up in the Well I think he'd start taking notice a lot more. Though its a good point that Creepers have very little reason to venture out to an island with no children to target; they strike me as more a zoo and candy store crowd.

Angels have full intellectus. What happens if Nicodemus asks Anduriel, "what supernatural entities are within one mile of me"?

Personally Id dial down the radius just to avoid getting overloaded   But I see your point, anyone else Id say he may simply not be /allowed/ to reveal that aspect of Reality, it seems specifically reserved for Children.  But he's already breaking the rules, so may he has told him, maybe he's aware that they exist even ifhe cannot sense them directly or retain personal memories of them.  Or maybe a Fallen bonded as long and tightly as those two can just provide/overlay the sensory capability like how Lash let harry ultrasound see in the Dark.

EDIT: Even worse... what if a kid writes about the haunts and Ivy picks up the information? When Ivy hits whatever age makes you forget about the haunts, does the information get deleted from the Archive, or reclassified from "nonfiction" to "fiction", or what?

ooh, that's dark...  She's likely a special enough case that can just KNOW that sort of thing, retain it without risk of revealing it and damaging whatever Cosmic Machinery is in motion.  Like a Fallen, if anything could keep you from Forgetting it would be (cue ominous voice) THE ARCHIVE...

Who knows, maybe Marcone will get Gard to work out some levitation runes, raise it over the clouds and see if anything wakes up.

You know, all joking aside it DOES mention that there are tonnes of gargoyles on the thing, getting more and more ugle as you go up.  Historically those are supposed to be supernatural guardians, I wonder if his are similarly legit in some fashion (He's not the sort to decorate like that without purpose)

   Well, someone bought a London Bridge made of stone took it apart and shipped it to Arizona and put it up over a man made lake in the middle of the desert..

Well, to be fair it sounds like that one actually just used the original stone to facade over modernized concrete structure.

What Marcone was /wanting/ to do was this:


Which makes sense in light of Marcone, Morgan, and Murphy all having inspiration taken from that show.  Makes me really think there was some magic significance to it like in the show, either the castle itself provides different protections, he was trying to control the NN side, or maybe like the show it satisfied some magic spell condition. 

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I don't think the Forsaken lived any longer than was expected for a non-Oath Rod using channeler (potentially 600+ years); the 3000 years sealed in the Bore don't count, they were in suspended animation. The Forsaken were promised immortality if they won; they didn't yet have it.

Of course, some of them were recycled into new bodies, but that's different...

I'm not sure any of the evil minions were actually immortal either; gholam might be, since they're constructs like the Green Man who was around for 3000+ years, but I think the ones we see survived in stasis...

I have to say I really dislike this concept of beings that adults can't ever know about. It doesn't seem to fit well with stuff already established in the series.

- When Harry was a ghost, Lea made a big deal about how his ghost-memories were perfect, not stored by his brain but in the universe itself. So if he knew about these creatures as a kid but was made to forget later, he still should have remembered as a ghost.

He had to think about things first to get caught in that, and it was dangerous enough he actively tried no to, lest he loose a decade on a Pink Floyd Album.  If he'd starte ruminating on "the first time he fought a monster" he might have gotten a different memory than the HWWB/Justin scene. 

- What if some haunts are hanging around on Demonreach when Harry uses his intellectus to see if there are any monsters around? Shouldn't intellectus override whatever power or effect keeps them hidden from adults?

Given that it apparently affects the "adult" intellect of Mouse and only his Guardian-ness seems to (barely) get past it, it's possible the Creeper's mass  protection would count him as Too Old to sense them. 

So, one of the longstanding aspects of the Dresden Files is that somehow, despite there being no real coordinated effort to hide the Supernatural, the mortal world maintains a nigh supernatural ability to simply ignore what happens around them and move on with their lives.  Everytime this comes up the explanation is more or less that Humans are great at ignoring things that make them uncomfortable, and have managed to hide the Truth from the collective human society without any significant effort. 

Zoo Day showed us that this is actually a much deeper, actively reinforced function of our world.  Turns out that every child is Trained, actively and with purpose, that there exist things that will prey on them but that nobody in Authority will be capable of recognizing or remembering, so it's better for yourself and everyone to handle it however you can, tell nobody, and move one with your life.  What's more, it seems like this is a specific charge and function of these Creepers, something that divinity like Mouse is Required to respect. 

The Children of the DV are all being Conditioned from an early age to pretend that anything labeled supernatural cannot (not Will Not, CANnot) be recognized by Authority, and you will be labeled crazy if you try to make them.  So Dont Try.  This is a patterned response that a whole class of creature exists solely and specifically to Train into mortals from an early age.