Sunday, 15:40 
Architects of The Ancient World
Architects of the Ancient World
featuredocumentary, history
Throughout human history, architecture has served to showcase power and express meaning. But buildings also keep secrets. By accident, and by design, whole cities were written in invisible ink, kept safe from the prying eyes of outsiders. This program explores why ancient people riddled their most impressive creations with secrets, and how modern scientists are learning to uncover them.