The Colosseum ( KOL-?-SEE-?m), also known as the Flavian Amphitheatre (Latin: Amphitheatrum Flavium; Italian: Anfiteatro Flavio [a?fite?a?tro ?fla?vjo] or Colosseo [kolos?s??o]), is an oval amphitheatre in the middle of the city of Rome, Italy. Constructed of travertine limestone, tuff (volcanic rock), and brick-faced concrete, it was the largest amphitheatre ever constructed at the time and held 50,000 to 80,000 spectators. The Colosseum is just east of the Roman Forum. Construction started under the emperor Vespasian in AD 72 and was completed in AD 80 beneath his successor and heir, Titus. Further modifications were made during the reign of Domitian (81--96). These three emperors are known as the Flavian dynasty, and the amphitheatre was named in Latin because of its association with their family name (Flavius).
The Colosseum could hold an estimated 50,000 to 80,000 spectators at various points of its history over the centuries, having a typical audience of some 65,000; it was used for gladiatorial contests and public spectacles such as mock sea battles (for only a short time as the hypogeum was soon filled in with mechanisms to support the other activities), animal hunts, executions, re-enactments of famous battles, and dramas based on mythology.
The Reichstag (German: Reichstagsgebäude pronounced [??a?çsta?ksg??b??d?]; officially: Deutscher Bundestag -- Plenarbereich Reichstagsgebäude pronounced [ ?d??t?? ?b?nd?s?ta?k ?ple?na?rb?ra?ç ??a?çsta?ksg??b??d?]) is a historic edifice in Berlin, Germany, built to house the Imperial Diet (German: Reichstag) of the German Empire. It was opened in 1894 and housed the Diet until 1933, when it was severely damaged after being set on fire. Following World War II, the building fell into disuse; the parliament of the German Democratic Republic (the Volkskammer) fulfilled in the Palast der Republik in East Berlin, while the parliament of the Federal Republic of Germany (the Bundestag) fulfilled in the Bundeshaus in Bonn. The destroyed building was made secure against the elements and partly refurbished in the 1960s, but no attempt at full restoration was made until after German reunification on 3 October 1990, when it underwent a reconstruction led by architect Norman Foster. Following its completion in 1999, it once more became the meeting place of the German parliament: the modern Bundestag. The expression Reichstag, when used to connote a diet, dates back to the Holy Roman Empire. The building was built for the Diet of the German Empire, which was succeeded by the Reichstag of the Weimar Republic. The latter would become the Reichstag of Nazi Germany, which left the building (and ceased to function as a parliament) after the 1933 fire and never returned, using the Kroll Opera House rather; the term Reichstag hasn't been used by German parliaments since World War II. In today's usage, the term Reichstag (Imperial Diet) refers mainly to the construction, while Bundestag (Federal Diet) identifies the institution.Source: Wikipedia