The Temple of the Emperor Hadrian was officially dedicated in 145 AD by Emperor Antoninus Pius. This ancient structure once stood as a monument to Hadrian, reflecting the grandeur of Roman architecture and the reverence of the era.
Centuries later, the old temple’s remains found new life as part of a larger, more modern building project. The stone columns and impressive walls were incorporated into construction that would serve a different purpose. By 1690, the building was completed and used as the Papal Customs House, a place where trade and taxes were managed in the city.
Today, the building that once housed the customs office has taken on yet another identity. It now serves as the home of the Stock Exchange (Borsa), connecting the site’s ancient origins to the city’s active financial life. The historical layers of the temple can still be seen within the walls, offering a unique blend of past and present in the heart of Rome.
Source - https://en.wikipedia.org/wiki/Temple_of_Hadrian