There are a few dozen 'Devil's Bridges' throughout Europe, two of which are in Switzerland, and one of which I got to cross.
There are different stories behind each of the bridges but they all have similarities. First, the bridge is built over a big river with lots of rapids. Second, the Devil always demands the first living thing to cross the bridge. And third, the first living thing is always an animal.

Here is a short version of the Swiss story:
A Swiss herdsman who often visited his girlfriend had either to make his way across the Reuss River with great difficulty or to take a long detour in order to see her.
It happened that once he was standing on a very high precipice when he spoke out angrily, "I wish that the devil were here to make me a bridge to the other side!"
In an instant the devil was standing beside him, and said, "If you will promise me the first living thing that walks across it, I will build a bridge for you that you can use from now on to go across and back. The herdsman agreed, and in a few moments the bridge was finished. However, the herdsman drove a chamois across the bridge ahead of himself, and he followed along behind.
The deceived devil ripped the animal apart and threw the pieces from the precipice.






