It is the Lin Cove Viaduct just outside of Blowing Rock NC on the world's most beautiful scenic road, the Blue Ridge Parkway.

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There are similar elevated roadways in the Rockies...it's a way to build a hiway with minimal destructive impact on the terrain..ordinary road construction tears hell out of the landscape...there's also something similar ( though less scenic) where I 45 goes through downtown Houston..it's called 'The Pierce Elevated'...

and at the beginning of this structure is also a still ground

isn't it bridging over a canyon, rocks, or whatever beneath that structure? because eventually, at the end of this structure is a still ground.

It's the Blue Ridge Parkway south of Asheville.

Nope..a bridge is a structure that "bridges" a gap of some sort..the sides of a river, a canyon, mainland to island, etc...an elevated highway is exactly that, a roadway that has been built up from the grade...

Wow! good view and good shot!

isn't it called a bridge?