The Roman cistern leads the visitor into the underground Amelia, exactly under the current Piazza Matteotti, corresponding to the ancient Roman forum. The imposing construction consists of a large rectangular room carved into the limestone and divided into ten parallel communicating rooms, covered with barrel vaults and covered with a masonry in small stones (opus incertum).

The complex is one of the best examples of the Romanization process undergone by the small Umbrian town around the 1st century BC. It was built to collect rainwater for drinking. Very well preserved, it has kept all its fundamental components: the water inlet system, the internal device for regulating its level and the tank emptying system.

In a corner of the first room there is a small portion of flooring, made with bricks. Interesting is the presence of the stamp with the name of the owner of the brick factory, Caius Atilius Fortunatus.