[SunkenCiv]

The 2000-year-old shell grotto was used as an outdoor dining room and features a sizeable wall mosaic featuring brightly colored shells, coral and glass.

Emanuele Antonio Minerva/MiC

[Jamestown1630]

The Margate shell grotto in England is something like that:

https://en.wikipedia.org/wiki/Shell_Grotto,_Margate

https://www.atlasobscura.com/places/margate-shell-grotto

[allendale]

More evidence that “la dolce vita” has always been at the core of Italian culture.

[packagingguy]

Looks like they found Ariel’s palace.

[ProtectOurFreedom]

"...celebratory scenes of naval and land battles likely funded — and won — by an extremely wealthy aristocratic patron who commemorated the victories on their walls"

Sounds like this wealthy aristocrat ran a piracy operation.

Wow...

And without any SuperGlue!

[Cronos]

Rome in 700 AD looked like this