In this GQ thread, the OP asks how the purpose of ancient monuments such as the Pyramids was forgotten. The OP then goes on to ask what it would take for society to forget the purpose of modern structures and/or monuments, such as Mt. Rushmore.
I’m wondering if there are any structures or monuments, less than, say, 200 years old, whose purpose, builder(s), or history remains a mystery.
In that thread, I mentioned a clock in Neosho, Missouri. It’s right there in the middle of the city’s downtown park, but no one seems to know who built it, or when or why. Trouble is, Neosho has only been settled for about 200 years or less.