On the outskirts of Rome, Italy, sit the ruins of Ostia Antica. The ancient port city isn’t as well-known as the nearby Colosseum or Roman Forum, but — as archaeologists recently learned — it contains some equally unique ruins.

Archaeologists working at Ostia Antica, an ancient Roman port city, have discovered the oldest Jewish ritual bath outside of the Middle East, along with an oil lamp decorated with a menorah dated to the fifth to sixth centuries.

Instead, the archaeologists — budding and not — last summer uncovered what may be the oldest existing example in the ancient Roman world of a mikvah, a Jewish ritual bath. They have tentatively dated the structure to the late fourth or early fifth century.