Just south of Leinster House is Ireland's National Museum of Archaeology, one of four branches of the National Museum of Ireland, and home to a fabled collection of Irish artifacts dating from 7000 BC to the present. Organized around a grand rotunda, the museum is elaborately decorated, with mosaic floors, marble columns, balustrades, and fancy ironwork. It has the largest collection of Celtic antiquities in the world, including gold jewelry, carved stones, bronze tools, and weapons.
The Treasury collection, including some of the museum's most renowned pieces, is open on a permanent basis. Among the priceless relics on display are the 8th-century Ardagh Chalice, a two-handled silver cup with gold filigree ornamentation; the bronze-coated iron St. Patrick's Bell, the oldest surviving example (5th–8th century) of Irish metalwork; the 8th-century Tara Brooch, an intricately decorated piece made of white bronze, amber, and glass; and the 12th-century bejeweled oak Cross of Cong,
covered with silver and bronze panels.
The "Ór: Ireland's Gold" exhibition gathers together the most impressive pieces of surprisingly delicate and intricate prehistoric goldwork—including sun disks and the late Bronze Age gold collar known as the Gleninsheen Gorget—that range in dates from 2200 to 500 BC. Upstairs, "Viking Ireland" is a permanent exhibit on the Norsemen, featuring a full-size Viking skeleton, swords, leather works recovered in Dublin and surrounding areas, and a replica of a small Viking boat. A newer attraction is an exhibition entitled "Kinship and Sacrifice," centering on a number of Iron Age "bog bodies" found along with other objects in Ireland's peat bogs.
The 18th-century Collins Barracks, near Phoenix Park, houses the National Museum of Decorative Arts and History, a collection of glass, silver, furniture, and other decorative arts, as well as a military history section.