The letters "AEIOU" can be found scattered throughout Vienna, etched in stone, engraved on buildings, and inscribed in art. But what do they mean? In this episode, we unravel the mystery behind these enigmatic letters that have puzzled historians and locals alike for centuries. These seemingly simple vowels are linked to grand ambitions of world domination and the Habsburgs' intricate political strategies. Join us as we explore the fascinating history and myriad interpretations of "AEIOU", from the Middle Ages until today.