In the heart of Burgundy, the small town of Cluny holds a secret. The abbey standing tall in the city center is a mere fragment of what the 11th-century Maior Ecclesia once was, the biggest church ever conceived at the time, a feat that was accomplished in less than 70 years. Thanks to incredibly realistic 3D models and interviews with the best experts, these architectural wonders are explained.

In the heart of Burgundy, the small town of Cluny holds a secret. The abbey standing tall in the city center is a mere fragment of what the 11th-century Maior Ecclesia once was, the biggest church ever conceived at the time, a feat that was accomplished in less than 70 years. Thanks to incredibly realistic 3D models and interviews with the best experts, these architectural wonders are explained.