Drevant Gallo-Roman site dates from the 1st to 3rd centuries and includes a well-preserved theater, a sanctuary, two bath complexes, and residential areas. It was a secondary settlement connected to river navigation and a local road. By the 4th century, the site abandoned, and the theater became a craft workshop. In the Middle Ages, the ruins were used as a stone quarry.
The structure combines elements of both an amphitheater and a theater, with an 85m-wide cavea supported by buttresses. The 27m-diameter arena, enclosed by a 2.6m-high podium wall, suggests it was used for circus performances.
Initially mistaken for a forum, the sanctuary features a large enclosure (116 × 89m) with a small central temple (fanum). Over time, it was expanded with monumental entrances, an octagonal sacred structure (possibly a bidental), and surrounding buildings.
Discovered in 1835, the two bathhouses (35 × 29m and 42 × 33m) had typical Roman features, including heated rooms. They were likely supplied by an aqueduct sourcing water 5 km away.
Developed in the late 1st or 2nd century, housing blocks were found mainly north of the site. Some residences included baths, while others may have served as inns or worker lodgings. Abandonment began in the mid-3rd century.
The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.