Visitors walked up a spiral staircase in the center rotunda of the Colosseum to see a 360 degree view of London on the surrounding wall. Scaffolding is still up in 1829, awaiting worker's completion.

Source: Ackerman, Aquatint. The Interior of the Colosseum in Regent's Park, 1829 in Barker F, Jackson P. London -- 2000 Years of a City & Its People, 1974.
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