It is located on the east part of the forum area. The remains we can still admire today, are  dated I cent. BC. They consist of a podium part, with two of the six original  columns in Corinthian order, with traces of the original plaster. Parts of a third column, on the right side, are today visible as part of a wall of a private house. On the architrave, an inscription dedicates the temple to Castore and Polluce and mentions the name of the two magistrates who took care of its realization utilizing money coming from the temple treasure.