Monuments and Ruins of Rome
There are so many items of historic or artistic significance in Rome that it is difficult to list them all. Among the others you see listed here, you may want to pay a visit to the following:

The Arch of Constantine is the greatest of the 3 Roman triumphal arches. 25 meters high, it was built during a period of decline in Rome. With the growth of Constantinople, Rome found its wealth fading and, as a result, much of the arch was constructed from materials taken from other monuments and buildings. The monument is highly representative of typical Roman architecture. It was originally built to mark the limit between the Roman Forum and Coliseum area.

Trajan's Column was erected in the second century as monument to the exploits of the Emperor and to be his sepulcher. 42 meters high, with a spiraling relief that depicts significant events in his life, the monument has a stairway that reaches to the top and a crypt which hold Trajan's ashes today. The column was originally a part of the Imperial Forums.

Catacombs of Domitilla are underground cemeteries that spread for kilometers through a network of subterranean galleries into which numerous tombs were dug. Until the 4th century, they were used only as a burial ground where the cult of the dead was celebrated with liturgical commemorations. From the 6th century until the 12th, the catacombs were used for the worship and commemoration of the martyrs.

The Quirinal Palace was, at first, a grand papal see. Afterwards became the official residence of the Italian Royal Family and finally it became the President of the Republic's residence. Not as ornate as many similar buildings in the city, it nonetheless should be noted for the creative geniuses who were a part of its design and its significant role in the cities history. Another palace which was used by the early popes was the Castel Sant Angelo.

The capacity for the great Circus Maximus was a quarter of a million people - about one quarter of Rome's population! Today you can still see the ruins of the Circus Maximus, used primarily for horse-racing, although it was used on occasion for hunts or mock battles. It was twice destroyed by fire and on at least two occasions the stands collapsed, killing many people. The last race held at the Circus Maximus was in 549 A.D., nearly a full millennium after the track's construction.