The "Round Temple" is found, along with the Temple of Portunus, in the archaeological area of the Boarian Forum , which was the ancient meat market of Rome. Since the Renaissance until recently it was known as the Temple of Vesta because of the similarities with another temple, located in the Roman Forum , dedicated to this goddess. When the dedicatory inscription made by an olive merchant by the name of Marcus Octavius Erennius was found, the temple was correctly attributed to Hercules. Moreover, in the area around the Boarian Forum, there already existed other monuments dedicated to this divinity. The temple itself is the oldest existing example of a marble building in Rome. It was built, using Greek pentelic marble, in the first century b.C. with additional refurbishing done, using different varieties of marble, under the Emperor Tiberius. In the twelfth century it became a church dedicated firstly to Saint Stephen and then, in the sixteenth century, to Saint Mary of the Sun . Inside the building various frescoes dating from the 1400s have been recovered.
GUIDED TOUR FOR GROUPS (closed on August) 1st Sunday of every month, hours: 10.30 am and 12 am 3th Sunday of every month, hours: 9.00 am and 12 am - languages: English, Italian, French, German, Spanish - persons: up to 30pax - duration: about 1 hour - cost: € 130.00
TOUR WITH ACCOMPAINST 1st Sunday of every month, hours: 10.30 am and 12 am 3th Sunday of every month, hours: 9.00 am and 12 am - persons: up to 30 pax - duration: about 1 hour - cost: € 40.00
The site is opened on 1st and 3th Sunday of every month.