- "While the Colosseum stands, Rome shall stand; when the Colosseum falls, Rome shall fall; when Rome falls, the world shall fall."
– Saint Bede
One of, if not the most impactful Wonder in the game, the Colosseum is invaluable to players who have many closely-packed cities to benefit from its Culture and Amenities bonuses. However, its construction is not too competitive but has high opportunity cost due to its restriction: it needs to be built next to an Entertainment Complex, the least used specialty District in the game. In Rise and Fall, the requirement is even higher, as the Colosseum now needs an Arena as well, an underwhelming building, to say the least. If you have to expend Production on low-priority items an Entertainment Complex and an Arena, but somehow miss out on the Colosseum itself, that is a huge setback, so civilizations and leaders with abilities to hasten Wonder and District construction - including Amanitore, Qin Shi Huang, and Egypt, or even Brazil and Byzantium with their cheaper Street Carnival and Hippodrome - should definitely focus on building this Wonder. The Aztecs can also focus on this because they will want their unique Tlachtli up anyway and they can use Builders to build districts very fast, although they most likely will conquer the Wonder from someone else.
One very notable mention is Scotland. The Colosseum has very tight synergy with the Scottish civilization ability, granting them Science, Production, and Great Scientist and Great Engineer points. Considering Amenities from Entertainment Complexes benefit Scotland hugely, it is certainly important for them to be able to build this Wonder.
The Flavian Amphitheater, better known as the “Coliseum” lies in the center of Rome. Construction began during the reign of Emperor Vespasian, c. 72 AD, funded by the spoils from the Jewish Second Temple after the fall of Jerusalem during the First Jewish-Roman War. Built of concrete and stone, it is the largest amphitheater ever built, and one of the great wonders of ancient architecture and engineering. It could hold between 50 and 80 thousand spectators to watch gladiatorial matches, animal hunts, mass executions, and more. By the time medieval Christianity had taken root, it had been repurposed to house low-rent apartments, workshops, quarters for a religious order, a quarry and a Christian shrine. Although knocked about by earthquakes and pillaged by stone-robbers, the Coliseum is still pretty impressive two millennia after the inaugural gladiatorial slaughter.
Build every district type in one city and the Colosseum