Promised Land vs Xanadu

Promised Land

noun
  • Any place to which one eagerly seeks to go and which one expects to greatly improve one's situation. 

name
  • The area historically known as Judea, which was promised to the Israelites by God according to oral tradition recorded in the Book of Genesis. 

  • Heaven or the afterlife. 

  • The United States of America. 

Xanadu

noun
  • An opulent building or resort that provides entertainment or luxurious living. 

  • A place full of beauty, happiness and wonder. 

name
  • The summer capital of Kublai Khan's empire. 

How often have the words Promised Land and Xanadu occurred in a corpus of books? (source: Google Ngram Viewer )