The Concordia National Museum, the first state antiquarian institute in the post-unification Veneto, preserves the finds from the excavations of the ancient Roman colony Iulia Concordia and from the neighboring territory.

Inaugurated in 1888, the museum was built from scratch to accommodate the material that emerged during the successful excavations conducted by Dario Bertolini, a Portuguese lawyer with a passion for archeology, in the urban area and in the "Sepolcreto dei Militi" of Concordia Sagittaria, as well as the conserved in the collection of the notable Muschietti family and in the Episcopal Seminary.

The building, designed by the engineer Antonio Bon, has a structure in the shape of an early Christian basilica with three naves, both to evoke the early Christianity of Concordia and to reflect the stylistic taste of the time, which tends to re-propose structures with a medieval appeal.

The Museum largely preserves what was the nineteenth-century layout: on the ground floor is the large room with three naves in which architectural elements, steles and funerary monuments, portraits and epigraphic material are exhibited; in an adjoining room, to the right of the entrance, there are marble portraits, decorative elements belonging to public and private spaces of Concordia and coins found in the countryside around Concordia.

On the first floor, in the three rooms, materials pertaining to the pre-Roman phase of the site and various finds from the Roman era are exhibited, such as bronzes, bricks, ceramics, glass, plasters and gems. Some of the pieces unearthed during the most recent excavations are also presented, including early medieval material.