But the visigoths couldn't find them, due to their invisibility.

The Invisi goths, on the other hand...

https://archive.ph/xiPE6 :

2019-05-03 | Study says ancient Romans may have built “invisibility cloaks” into structures | Ars Technica

'Or they might have noticed over the centuries that certain structures were more resistant to earthquake damage than others and modified their designs accordingly. '

' I had my doubts about the feasibility of really designing practical seismic invisibility cloaks when the research first started coming out, but once again researchers have proven themselves more clever than I could imagine."'

'Scientists are hard at work developing real-world "invisibility cloaks" thanks to a special class of exotic manmade "metamaterials."'

'Co-author Stephane Brûlé, a civil engineer at a Lyon-based company called Menard, demonstrated the possibility of this kind of large-scale acoustic and seismic cloaking a few years ago with colleagues from the Fresnel Institute in Marseille. '

'Metamaterials also sometimes cast a telltale shadow, since they do absorb some of the light shining through them. '

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