Simon Spies (1921-84) was a wealthy excentric Dane who had made his fortune in the travel business. Villa Spies, or Villa Fjolle as it's also called, was built on a small island in the Stockholm archipelago as a summerhouse. Swedish architect Staffan Berglund designed the UFO-like house in 1969. Here and here is where you go for more info and photos.
They say he had great sexual appetite.
Thanks to Mr J who ordered this post.