Designed by Bobotis+Bobotis Architects, the museum occupies a 28,000-square-meter plot on the northern edge of Patras, with 8,000 square meters of interior exhibition space. Outside, a 500-square-meter reflecting pool and a signature metallic dome mark it from a distance. The original budget was 21.5 million euros; the final cost reached 25 million. Greece's second-largest museum — after the National Archaeological Museum in Athens — it was conceived during the tenure of Melina Mercouri as Minister of Culture, though construction did not begin until 2004. Mercouri herself did not live to see it built, but the institution her vision helped launch became one of the most significant cultural projects in Western Greece.

The museum's largest permanent section takes everyday objects as its subject: the domestic, the personal, the human. Pottery, working tools, cosmetics jars, and jewelry span the Mycenaean, Ancient, Hellenistic, and Roman periods, with the oldest pieces dating to the seventeenth century BC. Alongside these cases, the museum has reconstructed Roman residences at natural size, using original materials, so visitors walk through rooms that once belonged to the prosperous citizens of ancient Patras. Most striking is the mosaic collection — fourteen Roman floor mosaics, most of them displayed vertically, covering a combined 250 square meters. The majority were pulled from the ruins of luxurious urban houses in Patras itself, evidence of a city that once ranked among the wealthiest in the Roman province of Achaea.

The Public Life section covers a remarkable sweep of time, from 1500 BC through the fourth century AD, organized around the structures that shaped civic existence: commerce, administration, religion, entertainment. Maps of the Roman territorial grid orient visitors within the ancient city's monumental topography. The objects on display — weights and measures, religious votives, theatrical masks, administrative seals — build a picture of Patras as Rome knew it: a busy Mediterranean port with the full apparatus of imperial urban life. The section offers a corrective to the common image of Greece as purely Classical; the Roman centuries here are vivid and particular.

The necropolis section is, in some ways, the most intimate part of the museum. Three tombs — two Mycenaean, one Roman — have been reconstructed at full scale, complete with the skeletons and grave goods found inside them. Burial architecture and its evolution from prehistoric through Roman times is traced not just through artifacts but through physical reconstruction, so visitors can stand at the threshold of a Mycenaean chamber tomb and understand, viscerally, what it meant to inter the dead in this way. Information on cremation rites, burial customs, and the beliefs that shaped them accompanies the reconstructions. The archaeologists of the 6th Antiquity Conservancy have noted that seventy percent of the items on display were seeing daylight for the first time in thirty years.

A fourth section rotates periodic exhibitions through the year, covering themes that connect the ancient world to the present — an inaugural show examined the culture of plants from antiquity to today. The vacant land adjacent to the museum is planned for development as a cultural park. For a building that spent three years locked and waiting, the museum has settled into its role as the anchor of Patras's cultural district with quiet confidence. The treasures that sat in storage for decades now have the space they deserved.