It is a secret of thousands of years, a real feast for the eyes that has been hiding right under the noses of millions of tourists. Rome is not unjustly characterized as an "open-air museum" as in addition to its magnificent and imposing monuments, it also hides great treasures hidden under the ground.

One of Rome's most famous landmarks, the Trevi Fountain, hides an archaeological site in its underground which dates back to the Roman Empire and early Christianity, such as the city's famous catacombs. It is the Roman aqueduct of 19 BC, located just below the Trevi Fountain, which was built as the top of this aqueduct.