Futuro, or Futuro House, is a round, prefabricated house designed by Matti Suuronen, of which fewer than 100 were built during the late 1960s and early 1970s. The distinctive flying saucer like shape and airplane hatch entrance has made the houses popular among collectors. The Futuro is composed of fiberglass-reinforced polyester plastic, polyester-polyurethane, and poly(methylmethacrylate), measuring 4 metres high and 8 metres in diameter.

More at http://en.wikipedia.org/wiki/Futuro

Even more at http://curious-places.blogspot.com/2012/07/futuro-house-raglan-new-zealand.html