Rome's, though not Italy's, most enduring icon is unquestionably its Colosseum. Constructed between A.D. 70 and 80 A.D., it had been in use for some 500 decades. The elliptical arrangement sat almost 50,000 spectators, who assembled to see the gladiatorial events in addition to other public spectacles, such as battle reenactments, creature investigations, and executions. Earthquakes and stone-robbers have abandoned the Colosseum at a state of ruin, but parts of the construction stay open for tourists, and its layout still affects the building of modern-day amphitheaters, some 2,000 decades later. Read More About Colosseum