Hazrat Mahdi (as) will beautify the world with the power of his lofty art, and the joy and beauty of the Qur'an will rule all places

NOWHERE IN THE WORLD WILL BE DEVASTATED, AND HAZRAT MAHDI (AS) WILL RESTORE AND GLORIFY ALL PLACES.
(Al-Mahdi Al-Mawud, Vol.1, p. 264)