The Dupont Castle web site describes the castle as having 33 rooms, including one room holding a 1500 year old viking drinking vessel.
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Visiting hours are Tuesday, Thursday, Friday, Saturday 12-4 p.m., Wednesday 12-8 p.m., and Sunday 1-5 p.m. Admission is $6 for adults, $5 ages 62 and above, $4 ages 6-18 and full-time students with ID. Children under six are admitted free when accompanied by an ad
http://en.wikipedia.org/wiki/Swan_Turnblad
More information at the American Swedish Institute