Abbie Gardner Cabin, Arnolds Park (N of Spencer on US-71), ☎ +1 712 332-7248. Memorial Day weekend-Sep M-F noon-4PM, Sa Su 9AM-4PM. A fatal encounter between Wahpekute Dakota Indians and settlers is at the forefront of this site, one of the locations etched in the history of the "Spirit Lake Massacre." Abbie Gardner was a 13-year old killed in the skirmish. Also learn about the Dakota leader Inkpadutah. Built in 1856 and listed on National Register of Historic Places. Free.