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 Circus Maximus:
-Was the largest stadium in Ancient Rome 
-At one point it could fit 250,000 people, a quarter of Rome's population
- It's been burned down three times in 31 BC, 64 AD, and 103 AD
- was occasionally used for events such as processions or gladiator combats, but on most days only chariot races.
- The last race in the Circus Maximus was held in 549 AD, almost a millennium after the first races were held at this location. 
http://www.aviewoncities.com/rome/circusmaximus.htm

Colosseum 
-Titus officially dedicated the Colosseum in A.D. 80 with a festival including 100 days of games.
-Measuring some 620 by 513 feet (190 by 155 meters)
-the Colosseum was the largest amphitheater in the Roman world.
- the Arch of Constantine, built in A.D. 315 in honor of Constantine I’s victory over Maxentius at Pons Milvius.
-Inside, the Colosseum had seating for more than 50,000 spectators
http://www.history.com/topics/ancient-history/colosseum

Aqueducts
-The aqueducts were built from a combination of stone, brick and the special volcanic cement pozzuolana.
-The aqueducts were built only to carry the flow of water in areas where digging, burrowing, or surface grades presented problems, such as valleys. 
-11 separate aqueducts supplied the city of Rome and were built over a span of 500 years
-nearly 200 cities within the empire were supplied buy aqueducts
-The last Roman aqueduct built was the Aqua Alexandrina built in 226 AD
http://www.unrv.com/culture/roman-aqueducts.php

Roman Forum
-The Roman Forum  was the central area of the city around which ancient Rome developed.
- Here was where commerce, business, prostitution, cult and the administration of justice took place. 
-Space where religious activities were conducted and the communal hearth of the city. 
-The Roman Forum was designed by the architect Vitruvius

-The main sight of the Forum include the Arch of Titus , the Temple of Saturn, Temple of Vesta, and the church of San Luca e Martina.
http://www.rome.info/roman-forum/