The Monar Jonban (Shaking Minarets), or Menar-e-jomban, is a monument located in Isfahan, in central Iran. Construction began in the 14th century to cover the grave of Amu Abdollah Soqla. Its notable feature is that if one of the minarets is shaken, the other minaret will shake as well.
The minarets are responsible for the fame of the otherwise architecturally undistinguished shrine. Because of the ratio between the height and width of the minarets and the width of the iwan, if one minaret is shaken, the other will shake in unison. This example of coupled oscillation can be observed from ground level.