Pre-Columbian rafts voyaged as far as Mexico and introduced metallurgy to the civilizations of that country. Some scholars and adventurers of the 20th and 21st century have asserted that the rafts and their crews journeyed thousands of miles across the Pacific to Polynesia, most notably Thor Heyerdahl who reached Polynesia on the Kon-Tiki raft. Several other people and groups have also built rafts based on prehistoric models and undertaken trans-Pacific voyages. Balsa is the Spanish word for raft. The use of rafts for commerce on the coasts of Peru and Ecuador, from northern Chile to southern Colombia, continued until the late 19th
Frogner century Scandinavian sea vessels - including the fully intact Oseberg ship - which were used as high status tombs. A collection of Viking weapons, utensils and talismans, buried with the ships, is also on display. The Kon-Tiki Museum is named after the raft on which Norwegian adventurer Thor Heyerdahl crossed the Pacific Ocean in 1947. Alongside the raft, the museum houses various artefacts related to Heyerdahl's other expeditions and a changing program of temporary exhibitions explores his life and work. Oslo City Museum is situated at Frogner Manor in the Vigeland park (Frognerparken). It is a museum of cultural history