We got the task to build a bridge with no mechanical fasteners, just with wooden laths.
We tried for a while!
Finally our teacher gave us a hint. And told us about Leonardo da Vinci - an Italian "Universal Genius" living from about 1450 to 1519.
Leonarda da Vinci had a great idea to build a bridge without any mechanical fasteners. It looks a little like weaving.
But look yourself: