Temple of Hadrian

The Temple of Hadrian is a temple to the deified Hadrian on the Campus Martius in Rome, Italy, built by his adoptive son and successor Antoninus Pius in 145 and now incorporated into a later building in the Piazza di Pietra (Piazza of Stone - derived from use of the temple's stones to build the piazza). It was once erroneously known as the Temple of Neptune.

• http://en.wikipedia.org/wiki/Temple of Hadrian