The original temple dating from the Augustan period (early 1st century) is thought to be built on an earlier Celtic sacred site. It measured 46 feet by 50 (based on a Roman foot of 31.7cm this makes 14.5m by 16m). This was built over by a larger temple in the 2nd century, measuring 65 feet by 70 (20.5m by 22m).
All that is visible now is a grass covered rectangular mound surrounded by a massive stone “gutter”. Many large blocks lie all around uncovered by various excavations. The most interesting carvings and many other finds are now in the Vivenel Museum in Compiègne. The temple is thought to have been dedicated to Bacchus or Apollo.