Baths of Nero
Pisa, Italy · built 92
The Baths of Nero (Italian - Bagni di Nerone) are an archaeological site near the Porta a Lucca in Pisa, then the Roman city of Colonia Pisana. Now below street level, they are the only Roman remains still standing in the city and form a thermae complex.
Archaeological site data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).