Devil’s Bridge – Ceredigion, Wales
The Devil’s Bridge is at a dramatic point in the landscape where the River Mynach tumbles ninety boiling metres in five steps down a steep and narrow ravine before it meets the River Rheidol and is unusual in that there are three separate bridges each one built over the previous one. The most recent is an iron bridge (1901), which was built over a stone bridge (1753), which was built when the original bridge was declared to be unstable.
Have Bag, Will Travel 
I think that’s a good one for the challenge. A similar one would be a pic of three locks. Not that I have one to hand.
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We used to have three locks on the canal near where I lived as a boy – top, middle and bottom, but I haven’t got a picture of them of course!
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I’ve done more threes than you can poke a tree times table at now! Thanks for that inspiration with the monkeys, it got me away from thinking about boring literal threes. 🙂
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Sometimes you just have to think outside the triangle!
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