It's a simple fact of life that eventually, sooner or later, you'll run across something and have no idea what it is.
In the old days when this happened, we'd simply have to shrug and then go on with our lives. But thanks to the internet, we can take our curious minds over to r/whatisthisthing and ask for some help. It's a near certainty that you'll find some answers.
This is adjacent to bags, but it isn't a bag in itself. It's actually a sheath of sorts that's designed to be put over suitcases and other luggage as a way to quickly identify stuff.
This is a rack of spikes, and that's all it is. More specifically, it's a storage rack for the spikes that are installed on the top of some wrought iron fences.
This weirdly discarded backpack is an air conditioning service manifold. You'd better believe that virtually every trade has a weird, highly specific backpack that's associated with it.
This isn't an example of houses on houses, exactly. The little house that's circled in the picture is a shrine to Saint Raphael, the patron saint of healing.
You know how you're not supposed to put cotton swabs in your ear? You are, on the other hand, supposed to put these things in your ear, because they're ear cleaners.
OP wasn't far off with their assessment, as these are bullet-adjacent. They're plastic blanks: load them into a gun and fire — the gun goes boom but no bullet comes out. These are the things that are used for re-enactments.
I thought this was some kind of miniature harpoon, but the truth is much worse: it's antiquated medical equipment that was apparently used during childbirth.
While some commenters guessed that this was honey from a bee infestation, it's an unlikely answer for a variety of reasons. It's most likely not honey (or mold), but caulk or sealant.
This is an old-timey thing you used to see more of. It's designed to reflect the light from an overhead traffic light to make it easier to see when the light turns green.
It's always fun when you discover something weird that someone has placed on your property, isn't it? These things are just survey targets for aerial photographers.
Let's go ahead and double down on the survey devices, as these things are survey prisms. They're pointing inside, which means someone is probably trying to take precise measurements of the indoor area. I don't think I would ever have guessed that.
You see a lot of weird things from a window seat up in the sky, and here's an example from Canada. The answer isn't too mysterious, though, as this is a Ducks Unlimited waterfowl habitat.
Here's a fun one: not the device itself, but a drawing. It isn't some kind of neck bomb, it's actually a T loop receiver, a type of hearing aid.
The r/whatisthisthing subreddit wouldn't be the same if it wasn't for Soviet-era knickknacks. This is an M1A1 Collimator, a device that can help fix the trajectory for artillery fire.
As a person who owns a pilot's watch and barely knows how to use it, I can confirm that this thing is a slide rule. It's actually a pretty neat tool if you learn how to use it, one that can perform all kinds of calculations.
What is this? Why, it's a glimpse into our dystopian robotic future. Specifically, though, it's a multi-purpose clearpath AGV mobility platform, a type of robot that can be repurposed for a number of functions.
OP was absolutely correct with their assumption that this is a thumb guard, because this is a...well, it's a thumb guard. Specifically, it's a old-school thumb guard intended for butchers.
I'm going out on a limb here and saying that if you find something that looks like a bomb in a recent war zone, you should probably call a bomb squad. That's exactly what OP did, because this is a Russian landmine.
This is either a sinister tracking device or some kind of detection device. Turns out it's the latter: in this case, it's a bed bug detector called Wirepas. Note to self: don't stay in this hotel.
While some people guessed that these were the bung holes (heh heh) from wine barrels, they're actually parts for sample ports on a wine vat.
