When witnessing a pleasent sight

When Rasulullah Salallahu Alaihi Wasallam would witness a pleasing sight he would recite,

اَلْحَمْدُ لِلّٰهِ الَّذِىْ بِنِعْمَتِهِ تَتِمُّ الصَّالِحَاتُ

All praise is due to Allah through who’s bounty all righteous things are completed

Reference: 

  • Beautiful Sunnats