Located beneath the square front of the Notre Dame lie archaeological remains discovered via excavations from 1965 – 1972. The crypt offers a unique insight into the urban and architectural evolution of the Ile de la Cité, where the history of Paris began. Visitors can explore the 117m long / 28m wide area of foundations of buildings erected between the Gallo-Roman period and 18th century. The tour reveals the archaeological layers that make up the continuous 2,000 year reconstruction of Ile de la Cite via slide shows, models and guided tours. Roman history fans will be in their element.