9Colosseum (Colosseo)

The Colosseum has been Rome’s most recognisable building since being inaugurated in 80 AD. Even at first glance, it is easy to see why the monument has endured—the smooth travertine curves are irresistibly timeless.

In its heyday, the stadium would have been even more impressive because each of the now-empty arched openings was once filled with marble statues. Despite its toned-down appearance, the stone Colosseum is gleaming once more. The view from the outside is iconic, but make sure to travel into the depths of the arena to explore the ruins. That might be the most impressive vantage point of all.