Inside or outside this structure is jaw dropping impressive.
“The Coliseum is one of the most imposing ancient structures. Imagine it all white, completely covered in splendid travertine stone slabs. It is elliptic in shape in order to hold more spectators. It had four floors; the first three had eighty arches each; the arches on the second and third floors were decorated with huge statues.
What we see nowadays is just the skeleton of what was the greatest arena in the ancient world. Three-fifths of the outer surrounding brick wall are missing. In the Middle Ages, when no longer in use, the Colosseum was transformed into an enormous marble, lead and iron quarry used by Popes to build Barberini Palace, Piazza Venezia and even St. Peter’s.
After the VI century, with the Empire’s decline the Coliseum fell into disuse and its walls housed confraternities, hospitals, hermits and even a cemetery. From the Middle Ages onwards, the Coliseum has been one of Rome’s and the world’s greatest marvels, attracting hoards of visitors.
Threatened with demolition by Sixtus V for town-planning reasons, it was declared a sacred monument dedicated to the Passion of Christ by Benedict XIV, placing a cross on a pedestal, as a symbol of the sufferings of all Christian martyrs. This cross is still the starting point for the Stations of the Cross on Good Friday. Since then, it has become an object of worship for Christians and was protected from further destruction and ruin; in fact, Popes after that restored and consolidated it.”
Reference: Italy Guides