To add more huge timber structures to the list, here’s a starting point to see/learn more about the historical Kennecott mine in Wrangell-St. Elias Nat’l park in Alaska [0]. I’ve had the good fortune to walk through it–it is simply incredible.

[0]: https://www.nps.gov/wrst/learn/historyculture/kennecott-mine...

All of these sound good, but the caveat is that they are wood + epoxy/resin/glue.

Why is that a caveat?

The knife in the article is just wood, with some food-grade oil on the surface.