Objects from the Stone Age to the 16th century are displayed in the Museum of National Antiquities, Sweden's largest archaeological museum. The plain design of this 1940 building - the façade looks like a tall brick wall with a door - gives no indication of the treasures within. To see the best exhibit, enter the darkened hall on the ground floor, where an impressive collection of Viking rune stones, swords, skeletons and jewellery is displayed. Detailed texts (in English) and maps describe the Vikings' economy, class structure, travels and methods of punishment. In the large halls upstairs, you'll find beautiful wooden church altarpieces, textiles and other medieval ecclesiastical artworks. Don't miss the basement, where the circular Guldrummet (Gold Room) displays more than 3,000 artefacts in gold and silver, from the Bronze to the Middle Ages. This collection was made possible by a unique Swedish law, more than 300 years old, which entitles the finders of such treasures to payment equal to their market value. In the foyer there's a copy of an Athenian marble lion statue - check out the Viking graffiti on its side. In 2004 the museum hit the headlines in connection with an installation about suicide bombers by an Israeli-born artist. On a visit to the museum, the Israeli ambassador to Sweden intentionally knocked over a lighting stand into the red pool designed to represent blood, shorting the electricity and causing a huge stir.