Emperor Domitian's ramp connects Roman Forum with Palatine hill.
A first-century ramp that leads from the Roman Forum up to the hilltop imperial palace on the Palatine hill opened to the public on 20 October, following a six-year restoration process.
The monumental arched passage-way was built during the 81-96 AD reign of Emperor Domitian who was the third and last emperor of the Flavian dynasty.
It linked the city's political, business and administrative base in the Roman Forum to the emperor's private palace on the Palatine Hill.
The incline, which has seven different levels and six hairpin turns, was first discovered by archaeologists in 1900 but restoration only began in 2009.
The structure is 35m from top to bottom, the equivalent of more than 10 storeys.