This historic abbey is one of the largest monastic complexes in Europe and is known for its stunning architecture and rich history, including its connection to Eleanor of Aquitaine. It is a UNESCO World Heritage site and serves as a cultural center today.This historic abbey is one of the largest monastic complexes in Europe and is known for its stunning architecture and rich history, including its connection to Eleanor of Aquitaine. It is a UNESCO World Heritage site and serves as a cultural center today.