A souvenir shop in Athens, Greece, filled with nostalgic memories and old relics. Credit: Magic Ketchup CC BY-NC-SA 2.0 Nostalgia has become a defining trait for Millennials and Gen Z-ers. In recent years, adult toy sales have surged, and the creation of adult coloring books has followed suit. However, this longing for yesteryears isn’t new. The concept of nostalgia in ancient Greece was a significant cultural force, shaping the lives and storie…