The so-called "Tempio della Tosse" is an ancient Roman building along the river Anio. Its dating is problematic, but it is likely a building of late antiquity that is built on the site of an earlier villa. It has been interpreted as a nymphaeum, a temple, and also as a tomb.
Description via Pleiades. Coordinates and heritage data from the Atika atlas.
Atika pings you when you walk or drive past heritage like this. Works offline, no account needed to explore.