When a dolmen drops and ends.

Many. Galen has some of the most impressive god rays because the air is clean and not foggy,

This is a weird thing to make a poll, since there's so many options and opinions to describe an area that resonates with a player.

I honestly really enjoy the art direction for all zones, and I find that most zones are very well curated by their creators. I prefer marshlands and grasslands as biomes, personally, but I really do find most areas in ESO to be quite striking. I also feel that given the objectively smaller maps which ESO uses, it is made up for by their well-crafted biomes to give the impression of a much, much larger area. You can see hand crafted examples very periodically by the visual story telling that the level designers use to add further non-interaction engagement. Level design is one thing the ZOS team is doing very well on, despite all other (potential) controversies.

Edit: Grammatical error.

Graven Deep. The view from the huge underwater windows, with the tower holding the weather control device looming ominously, and then the walk on the ocean floor that let you see the dwarven installation from the outside. Probably the most visually impressive dungeon in the game.

My real home land has much of high mountain and forest.
And also much of snow in the winter. So, Skyrim fauna is very familiar
for me. Unfortunately, the wolf were extinct. Can't meet that animal anymore
in my land.

Voted for Elsweyr, though not so much because of the dragons but because of the landscape. Especially Southern Elsweyr. Senchal remains my favourite ESO-original city, its central plaza with the palace is such a thing of beauty.

Honorable mentions go the Summerset coastline (especially the area around Corgrad and Lillandril), Moongrave Fane dungeon and, oddly enough, the Mistral docks. I've always loved that area.

That said, I love the landscapes and architecture in this game in general. Excepting perhaps the Daedric plains, I enjoy exploring all of them and it one of the main reasons I continue to play.

I still like the cliff arches of Auridon, as well as most of coastal Summerset.

Skyrim for sure but the fargrave out of bounds areas with the giant skeletons are really something. Reminds me of that sea monster you would see on Titan in destiny 2. Just something that makes you wonder what else is out there

Dragons are up there in top 2... but when I saw the underwater windows for the first time it blew my mind

it is barely impossible to choose.
The Art Team does the outstanding job, as all the zones are very recognizable and there are lots of stunning views.
Orsinium, Vvardenfell, Summerset, CWC, Elsweyr, Skyrim and Blackreach, even Murkmire, plus High Isle. Impossible to choose

Too many to count, and most of them aren't even among the choices offered.

The last couple of nights I spent some time running around Northern Elsweyr again, and visited several areas I hadn't seen in a long time, which brought back a lot of memories from when I was questing through that zone. It's such an amazing zone to me-- not at all the kind of place I'd ever want to live in (you can almost taste the dust in your mouth and feel the sand in your eyes), but so stunningly beautiful in its own way, and so well done.

However, I love all of the zones, and really can't pick a favorite. There is so much to see everywhere if you take your time and explore every nook and cranny. A lot of the time it's so easy to miss things because you're on your way somewhere and don't want to slow down for a leisurely look-see at something interesting, but if you do then that can lead you to something else, then something else, and so on.

My answer is always Western Skyrim. It's stunng.

Too many to choose from, but some of my favorites include Khenarthi's Roost, Betnikh, and the Reach. The auroras are nice when they come out as well, so I would love to see if they ever create Whiterun or Winterhold (although I wouldn't expect it so soon after Greymoor).

The view from the highest point you can reach in Hakkvild's High Hall is amazing.

High Isle and Galen are new faves