In which country would you find Mont-Saint-Michel?

In which country would you find Chichén Itzá? In which country would you find Neuschwanstein Castle? In which country would you find Stonehenge? In which country would you find the Alhambra? In which country would you find Hagia Sophia? In which country would you find the Burj Khalifa? In which country would you find the Petronas Towers? In which country would you find the Sydney Opera House?