You should absolutely visit prince Eugen’s old house at Djurgården in Stockholm. It was built 1905 as his palace. And was designed by Ferdinand Boberg. The gallery was added 1913. Prince Eugen was an artist, and a collector. His house was filled by artists and musicians. It’s been a museum since 1956. And it’s a must for art lovers. When I visited now, they had Alexander Klingspors paintings on display.