Mine would probably be White Sands National Park in New Mexico, USA. Also Great Sand Dunes National Park and Preserve in Colorado, USA.
The blowing sand got everywhere in my camera as I was trying to take macros. I’m surprised it made it out of those places alive.
I can only imagine what something like the Sahara would do.
In the rain. Anywhere in the rain. 
Even if I can protect my camera enough to still be able to use it, the rain gets on my glasses and then I can’t see well enough to use it.
Honorable mention for fog and mist. I can’t take pictures if I can’t see.
Oh right…although to be honest once it starts drizzling I go back to using my phone lol…
I recently sent in my camera for a free warrenty repair (issue with lens release button). Well, they found liquid damage inside, and it cost $500 to fix :/
I have been on some of the public beaches on Lake Erie here in Northeast Ohio for birds. The blowing sand and blowing water can be bothersome. But, the chance to see/photograph an American Avocet or Piping Plover… You just have to try to protect your camera as best you can.
Another challenging place and time to go out is in the dead of winter to look for gulls on the lakefront. That’s when the “good” gulls are out there! This past winter most of Lake Erie froze over and a lot of the Cuyahoga River froze up far upriver. It was very cold. But, the gulls were right in front of you taking advantage of the few openings in the ice. There was a water treatment plant maybe 15 miles upriver that emptied clean warm water into the river. That kept some of the Cuyahoga River open. There were long-tailed ducks, harlequin ducks and common goldeye in the river diving. It was cold. You had to wear proper footwear and clothes for the snow. You had to wear gloves that allowed you to operate your camera…and keep your camera somewhat covered and warm. But, seeing those birds was really nice despite the cold conditions.
I should note that, winters like that are very tough for the birds. They gather in the few open spots on the river or lake to try to find food. But, that means they are crammed together. Disease can easily spread. Their feathers can freeze.
Anywhere with the wind. Rain is fine, cold is fine, heat is fine… but wind is a real killer. I should specify that my main subjects are flora and arthropods and just try getting a decent image of them when they’re blowing about so hard and fast they don’t even remain in the frame for more than a microsecond!
Wow…you must have one good camera! I bought a second hand Nikon D3400 to replace the D3400 I had since 2019 for less than that I think.
Never had to do the above, as my subjects tend not to active (or present) in very cold weather, but commendable anyways. Not sure whether condensation on the lenses could be a problem.
Yeah you have the same subject as me. I do plants and ants…or should I say pl/ants. The wind definitely makes it hard to get that flowerhead to stay still to get a perfect image. For ants I try to get them to stay still by baiting.
Nikon Z9! I’m currently interviewing around and hopefully I can get a job to get some money in between finishing my current uni program and starting medical school.
Anywhere that I’m not alone.
Fair enough, I think most of us can agree with that. 
Humid places :( the moment I remove the lens cap, thr camera lens starts to fog up - and this usually happens when I am desperately trying to photograph something really cool in front of me before it flies away. I take the record shot anyways, and it turns out to be very hazy, as expected.
I’ve even got a really good and recent example for that: https://www.inaturalist.org/observations/367034785
Fortunately, my usual subject matter can’t fly away 
But yes, I’ve had encounters with humidity before and I’ve yet to research how to get around it.
Yep, that will do it. I default to phone camera when it starts raining.
