Temple of Castor and Pollux

The Temple of Castor and Pollux was built in Rome in 495 BCE to celebrate the victory of the Latin League at the Battle of Lake Regillus (495 BCE).
Under the Roman Republic, the Temple was used for Meetings by the Roman Senate. Under the Roman Empire, the Temple was used as the Office of Weights and Measures and as a Bank for the State Treasury.

The building had 8 marble columns on its two short sides, and 11 columns on its longer sides. They surrounded an inner chamber paved with mosaics.
It was constructed using Roman Concrete known as Opus Caementicium.