Answer by Neeraj Agarwal:
The Mathematical bridge in Cambridge, UKView Answer on Quora
When I first went to Cambridge, I was intrigued by this bridge because of the popular fable according to which the bridge had been designed and built by Sir Isaac Newton and that when it was first built, it did not have any nuts or bolts to hold it together. Subsequently a bunch of students tried to bring it apart but could not figure out how to hold the structure together and so were compelled to use nuts and bolts.
On digging deeper into its history, I came to realize that the above account which you will still find being narrated by the local guides/punt chauffeurs was just a myth. In reality, it was designed by William Etheridge, and built by James Essex the Younger in 1749, 22 years after Newton’s death. It was reconstructed twice after that but even the earlier versions had iron pins to hold it together.
However the bridge still fascinates due to its geometrical construction, whereby although it appears to be an arch, it’s made entirely of straight timbers, hence the name Mathematical bridge.
For further info: Queens’ College Cambridge - Mathematical Bridge