A popular attraction to visit in Prague is the John Lennon Wall. It was a normal wall once upon a time, but when Lennon passed away in the 1980's, lyrics and John Lennon inspired graffiti filled the wall.
John Lennon was considered a hero because his songs spoke about freedom which didn't exist when communism ruled. The John Lennon Wall is a place where individuals express peace and love creatively. Ever changing, this wall is spectacular to visit. It is recommended to go in the early morning to avoid crowds.
See more about this attraction here.