The Forestry Building in Portland, known as the "world's largest log cabin, build 1905, burned down 1964. Explore 25 of the world's tallest mass timber buildings and see what makes CLT and engineered wood so desirable.Day 3—12 December 1805 brought satisfying progress, and their first major challenge: "In the forenoon we finished 3 rooms of our cabins," Sgt. As part of our Timber Revolution series, we have rounded up the world's 10 tallest buildings with masstimber structures.