Greece began assembling state archaeological collections after independence in the nineteenth century, when excavations, building projects, antiquities trafficking, and the creation of a national capital made preservation urgent. Objects were first kept in temporary repositories around Athens, including the Temple of Hephaestus. A major national museum promised both safer storage and a public narrative connecting the modern state with the many societies of the ancient Greek world. Land donated by Eleni Tositsa and financing from Greek and international benefactors allowed construction of a permanent building on Patission Street.

Work began in 1866 from plans associated with Ludwig Lange, with modifications by Panagis Kalkos, Harmodios Vlachos, and Ernst Ziller before completion late in the century. The resulting neoclassical building used ordered galleries, courtyards, and a formal façade to express the status of a national institution. Later wings and internal alterations expanded storage, conservation, offices, and display. It remains purpose-built museum architecture, not an ancient monument reused for collections. Earthquakes, pollution, wartime danger, evolving accessibility, and changing exhibition standards have required repeated repair and modernization.

The museum holds major prehistoric, sculpture, vase and minor-arts, metallurgical, and Egyptian and Near Eastern collections. Objects include finds from Mycenae and the Cyclades, Archaic kouroi, Classical and Hellenistic sculpture, bronze statues recovered from the sea, ceramics from many regions, the Antikythera mechanism, and artifacts from Thera. These collections reach beyond a narrow story of Classical Athens. Excavated context, acquisition history, ancient repair, modern restoration, and uncertainty matter: a complete-looking statue may combine surviving fragments and modern joins, while some bronzes owe their preservation to shipwreck or deliberate concealment.

During the Second World War, staff and volunteers packed and buried antiquities beneath museum floors or transferred them to secure vaults to protect them from bombing and occupation-era seizure. The building was used for other purposes, and galleries reopened gradually after the war. Postwar conservators restored collections and reorganized displays, while later research revised attributions and chronology. The museum closed for substantial earthquake repairs in the 1990s and renewed galleries before the 2004 Olympics. Conservation laboratories continue to investigate materials and stabilize objects rather than returning everything to a falsely pristine appearance.

The Hellenic Ministry of Culture operates the National Archaeological Museum, with ticket prices, opening hours, temporary closures, and exhibition areas governed by current conditions. The visitor sees authentic ancient objects inside a historic but modern museum whose cases, mounts, lighting, labels, and circulation are contemporary interpretive systems. Replicas or reconstructions should be identified where used, and restored portions should not be confused with original ancient surfaces. The museum's history is itself significant: it reflects the creation of Greek archaeology, the rescue and movement of artifacts, wartime stewardship, scholarly revision, and continuing debates over context, ownership, and public access.