Xanadu

Xanadu can mean

 Another word for a utopia.
 Xanadu, a song by Olivia Newton-John and Electric Light Orchestra.
 Xanadu, a song by Rush
 Xanadu, a 1980 American musical fantasy movie
 Xanadu, the fictional palace in the movie Citizen Kane
 Xanadu 2.0 - the main residence of Bill Gates