 A major attraction in the city is the Viking Ship Museum ("Vikingeskibsmuseet") located alongside Roskilde Fjord.The centrepieces of its collection are the well-preserved remains of five 11th-century Viking ships, excavated from the fjord some north of the city in the late 1960s.The ships were scuttled there in the 11th century to block a navigation channel, protecting the city, then the Danish capital, from seaborne assault.