Salt Lake Tabernacle
"[The Salt Lake Tabernacle] is a peculiar building, the only one of its kind in all the world. It was built almost a century and a half ago in the days of the poverty of our people. It was literally a Tabernacle built in the wilderness. The temple was far from finished at the time. Those who built the Tabernacle did so with faith, as well as their rudimentary architectural skills. Skeptics, of whom there are always many, predicted that when the scaffolding was removed, the roof would come down with it. This did not happen, and it has remained in place through sunshine and storm through all of these many years."
Ref. (Gordon B. Hinckley, "A Tabernacle in the Wilderness," Ensign, May 2007, 43)
I was able to visit this last summer and it was awesome. The acoustics are unbelievable and like mentioned above, there is nothing like it as far as building structures like it. It was beautiful!