CIRCUS MAXIMUS. Only the outline of what was perhaps the world's largest stadium is visible today. It could seat 250,000 people and was nearly as long as seven football fields.
TRAJAN'S FORUM. Open to all Romans as a formal place to gather, it was the last imperial forum built, completed in 112 A. D. and designed by Apollodorus. It included a market space, library and public square, complete with marble floor and bronze ceiling.
AQUEDUCTS. The first modern system of supplying fresh water was built in Rome and provided 200 million gallons of water daily for more than a million users.
CARRACALLA'S BATH. This giant public bath was completed in 216 A. D. by the Emperor Carracalla. More than the length of two football fields, the bath could accommodate at least 2000 people and included a library, sauna, garden and meeting rooms.
ROMAN ROADS. The Appian Way was the first modern road, constructed about 312 B. C., connecting Rome and Brindisi, in southern Italy. It was particularly useful for moving the vast Roman armies.
PANTHEON. This temple to the gods was completed in 125 A. D., and it is the best preserved of all the ancient buildings in Rome. It was probably designed by Emperor Hadrian or Apollodorus and houses many statues of the Olympian gods and goddesses.
THE COLOSSEUM. An elliptical amphitheatre, it was built in less than a decade and completed in 80 A. D. Five floors high, it could seat up to 80,000 people with 76 entrances.