Gorsium/Herculia, Archaeological site and open-air museum in Tác, Hungary

Gorsium/Herculia is an excavated Roman settlement with visible street layouts, defensive walls, and building foundations spread across an open site. The remains span multiple periods and reveal how the place grew and changed over time.

The site started as a Roman military camp and developed into a settlement around 103 CE called Gorsium. Later it was renamed Herculia and became the administrative center of the Lower Pannonia province.

The name Gorsium appears in the 3rd-century Itinerarium Antonini as "Gorsio sive Hercule", pairing the old common name with the new official one after the 260s rebuilding. Each spring the archaeological park holds the Floralia festival, commemorating Septimius Severus's visit in 202 AD.

Reach the site from the M7 motorway at the Szabadbattyán–Tác-Gorsium junction, then follow road 6307 south for about 3 km, turn left by the cemetery and continue roughly 1.5 km along an unmarked access road. A long paved path with a low edge runs diagonally through the excavated foundations, and two blue-roofed shelters stand over parts of the ruins. The ground between the plots is grass, so sturdy shoes help.

In 258 CE, during a quickly suppressed civil war, the town council's treasury was hidden underground: 3,134 double denarii, found again during excavations in 1983, 1,725 years later. The coins are among the site's most concrete finds.