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Ronda Gorge Spain
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this post was submitted on 21 Mar 2026
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Those ancient stone arch bridges are remarkably durable, and can survive with very little maintenance. Many large stone bridges and aqueducts were built with no mortar whatsoever, and everything held together strictly through gravity. That requires quite a bit of skill with the stone cutting, though, in order for the weight to be distributed properly. And it makes them extremely costly and time-consuming to build. Wikipedia says the bridge pictured here took 30+ years to build, and that's after the original bridge built here collapsed a few years after being built.
The white lattice-pattern in this case seems to suggest mortar?