The magnanimous proportions of the Colosseum have long been a source of wonder. Originally envisioned in 70 CE, the construction of this grand structure was completed in 80 CE. At that time, it is believed that this vast amphitheater could seat upwards of 50,000 spectators at once. The Colosseum also features on the Italian version of the five-cent Euro. Deemed as one of the Seven Wonders of the World, the Colosseum was designed to be a horse racing circuit and arena for animal fighting and gladiatorial battles, although it has also hosted significant religious ceremonies in its early days. It is a symmetrical wonder set in the historic landscape of Rome's heart. The enormous ruin is a UNESCO World Heritage Site and is considered by many to be an iconic symbol of Italy.