The Triumphal Arch of Septimus Severus at the entrance to the Roman forum and Palatine.

The Roman forum.

I'm not sure what building this is.

More of the forum.

The Temple of Antoninus and Faustina.

The main square.

The Temple of Castor and Pollux.

Next we went in to the Temple of Caesar.

After Julius Caesar was murdered, his body was carried to the forum, near the Regia, which was his official residence as pontifex maximus. A funeral pyre was built and his body cremated. Initially a commemorative column was erected on the spot with a dedication to the "father of the fatherland", but soon after Augustus started the construction of a temple for his adoptive father who the senate had declared a god. The temple was finished and consecrated in 29 BCE. Someone left a half dozen roses on the spot.

The Temple of Saturn

More of the Temple of Saturn.