Of particular note is the unconventional architecture of the Hằng Nga guesthouse, popularly known as the “Crazy House”. Described as a “fairy tale house”, its overall design resembles a giant banyan tree, incorporating sculptured design elements representing natural forms such as animals, mushrooms, spider webs and caves. Its architecture, consisting of complex, organic, non-rectilinear shapes, has been described as expressionist. Its creator, Vietnamese architect Dang Viet Nga (also known as Hằng Nga), who holds a PhD in architecture from Moscow State University, has acknowledged the inspiration of Catalan Spanish architect Antoni Gaudí in the building's design. Visitors have variously drawn parallels between the guesthouse and the works of artists such as Salvador Dalí and Walt Disney. Since its opening in 1990, the building has gained recognition for its unique architecture, having been highlighted in numerous guidebooks and listed as one of the world's ten most “bizarre” buildings in the Chinese People's Daily. While superficially amusing, the compound is let down by the construction debris and household refuse behind the facades, and the lack of attention to safety issues.