The Nymphaeum is a partially preserved Roman public fountain complex built in the 2nd century AD, when Amman was the Roman city of Philadelphia. Dedicated to water nymphs — as Roman fountain complexes typically were — it would have been one of the most elaborate structures in the city, with tiered pools, statuary, and carved facades fed by an aqueduct system. What survives today are fragments of the rear wall, some carved stonework, and the outline of the original pools.
The site sits at street level just off the main downtown street, somewhat overshadowed by surrounding buildings and easy to miss. A small explanatory panel gives context. It is worth 15 minutes as part of any walk through the downtown Roman-era sites, linking the Citadel above with the Roman Theatre and the Roman baths at the valley floor.