Crazy house' façade in Da Lat city, Vietnam - The Crazy House (Ngôi nhà kỳ dị hay Ngôi nhà điên), Hang Nga Guesthouse (Biệt thự Hằng Nga) or Cobweb Castle (Lâu đài mạng nhện) was built by the Architect Dang Viet Nga. The crazy house is located at 3 Huynh Thuc Khang street, Da Lat city. It was voted one of ten craziest buildings in the world by the People's daily.