There areI visited three ancient villages on my Mid-Autumn-Holiday hiking trail in Anhui Province.

Its biggestmost amazing feature is the buildings made of rammed earthclay.

🧱, I'm not sure what you mean there.

It's said that the first people who came here where from Henan Province to avoid a war.

As a result, the people developed a method to construct houses using only the materials available in the mountains.

You can find some pictures here: https://mp.weixin.qq.com/s/uOFKkbZIBDolpRovKzfNQw and a video here:https://www.youtube.com/watch?v=ELnP2vcdWmM ¶
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I really love this small village.

There are three ancient villages on my Mid-Autumn-Holiday hiking trail in Anhui Provincealong the hiking trail I traveled on in Anhui Province during the mid-autumn holiday .

COMPARE: (A) on my Mid-Autumn-Holiday hiking trail → 如果您是这条小路的主人。
(B on/along the mid-autumn-holiday hiking trail → 如果您不是小路的主人。

The first one iwas a village built near the top of a mountain top.

注意：用过去时更好，因为您的旅行已经结束。

Its biggest feature is the buildings made of更平滑: Its most noteworthy feature was its rammed earth buildings.

把后面两句话合并成一句话，就像这样： It's said that first people came there from Henan Province to avoid a war over 800 years ago.

It was more than 800 years ago.[SEE THE PREVIOUS SENTENCE]

It's cozy and relaxing, e更好的: Even just walking along the small stone path was cozy and relaxing.

There are three ancient villages on my Mid-Autumn-H holiday hiking trail in Anhui Province.

Mid might also be lowercase.

Its biggest feature is that the buildings are made of rammed earth.

Possible "from rammed earth", but I don't know what you mean by rammed earth.

It's said that firstthe original people that came here fromcame from the Henan Province to avoid a war.

"the first people" is a little awkward since first is more used to compare things to the second or the third people, which does not really make sense here.

IThat was more than 800 years ago.

"that" is used when referencing events, but "it" is okay.

As a result, the people developed a method to construct houses using only the materials available ion the mountains.

The comma is not needed but adds style.

There are three ancient villages on my Mid-Autumn- Holiday hiking trail in Anhui P/the province of Anhui.

Its main feature is the buildings made of rammed earth./¶
Its biggest feature is the buildings made of rammed earth.

biggest is more like largest in this context. unless you mean there is only one building?

It's said that its first peopleresidents came here from Henan Province to avoidto flee a war.

in English we do not usually say "province" after a province name, better to leave it out here unless it's very formal.
they "fled" a war because it was already happening when they left. if they "avoid" a war it means they don't want a war to happen

At thate time, it was difficult to transport materials up to the mountain.

up to the mountain means it was transported upwards and arrived at the mountain
up the mountain means it was transported to the top of the mountain

It's cozy and relaxing, even just walking along the small stone path.

Its biggest feature is the buildings made of rammed earth.

The biggest feature of the buildings are made of rammed earth.