Via Sacra and Temple of Valerius Romulus, Forum Romanum in Rome

The Via Sacra (Latin: Via Sacra) (Sacred Road) was the main street of ancient Rome, leading from the top of the Capitoline Hill, through some of the most important religious sites of the Forum (where it is the widest street), to the Colosseum.
The road was part of the traditional route of the Roman Triumph that began on the outskirts of the city and proceeded through the Roman Forum.
In the 5th century BC, the road was supported by a substructure to protect it from the rain. Later it was paved and during the reign of Nero it was lined with colonnades.
The road provided the setting for many deeds and misdeeds of Rome's history, the solemn religious festivals, the magnificent triumphs of victorious generals, and the daily throng assembling in the Basilicas to chat, throw dice, engage in business, or secure justice.

The Temple of Romulus was dedicated by Emperor Maxentius to his son Valerius Romulus, who died in childhood in 309 and was rendered divine honours. A coin from 307 AD depicting the unusual round shape of the building, associates this building with Maxentius. It is possible that the temple was originally the temple of "Jupiter Stator" or the one dedicated to Penates, and that Maxentius restored it before the re-dedication.
The ancient Roman temple was Christianized and dedicated to Sancti Cosma et Damianus in 527, when Theodoric the Great, king of the Ostrogoths, and his daughter Amalasuntha donated the library of the Forum of Peace (Bibliotheca Pacis) and a portion of the Temple of Romulus to Pope Felix IV. The pope united the two buildings to create a basilica devoted to two Greek brothers and saints, Cosmas and Damian.
In 1947, the restorations of the Imperial Forums gave a new structure. The old entrance, through the Temple of Romulus, was closed, and the temple restored to its original forms; with the Pantheon, the Temple of Romulus is the best preserved pagan temple in Rome.

more on more on https://en.wikipedia.org/wiki/Via_Sacra and https://en.wikipedia.org/wiki/Santi_Cosma_e_Damiano