I found the White Gold Tower by using Whirlwind Sprint in Riften!

I did by standing on the roof center of the market place, then I used it again to get to the Blacksmith's roof and used it once again to get to the roof of the Bee and Barb, I went outside by using it once more. I wanted to try to run outside of Skyrim and I succeeded. I was on the other side of the mountains and was in Cyrodil. I saw the White Gold Tower and could approach it very close.

But why did Bethesda program it if it's not even meant to be seen?

I play on PC and is a Khajiit named Jo'Raq, lvl 82.
White Gold Tower in Skyrim!!!