Interesting that 'smart history' chooses a picture of the circus maximus that obscures the fact that it is now st peters basilica in rome, itself no small historical detail..
You are probably thinking of the Circus of Nero, which was the place where St. Peter was crucified upside-down. Peter was buried in a nearby necropolis, which is now the site of St. Peter's basilica. Drawings I've seen show that the east end of Circus of Nero site intersects the southern portion of St. Peter's Square. Also, the obelisk in the center of St. Peter's Square was previously in the center of the Circus of Nero, similar to the obelisk of the Circus Maximus shown in the video. There are enough similarities between the two places that confusion is understandable.
Can confirm that they have it right -- a) I was there a couple of months ago (and this would have been a tremendous resource to view just before doing the walk around), and b) they even have a picture of the contemporary circus maximus in the video.
